Dark ChromeCSS [Unpacked Extension]


What is this?
A small dev extension I made some time ago to skin chrome:// pages.

Where it works?
Made and usually tested with most recent Vivaldi snapshot, but it should work with any stable or snapshot version (Chromium 63+). And on mac/linux, of course ūüôā

It’s complete?
It’s a black/dark-gray theme but some areas are brigther (pale gray/black) to avoid messing too much with material design/chromium colorizations.
Some advanced chrome:// may need a bit of tuning but I’m already pretty satisfied.
This also because chromium takes colors from a lot of sources. I’ll fix what I can.

It slowdown the browser?
It shouldn’t. While it inject the css to chrome pages, it does it with chromium native APIs, so it should be quite fast.

I don’t like colors…
Just open custom.css and change them ūüôā
If you improve some areas, just change it – and paste your .css somewhere for anyone interested in it.

I need it?
Well, actually is an extension/modding tool. So, if you are not interested in messing with browser css or internal pages, probably you don’t need it.

It’s safe?
I didn’t placed harmful things inside, it’s just a js loader which only¬†inject custom.css to chrome:// pages.
You can disable/remove it anytime without any issue and it shouldn’t corrupt vivaldi in any way.

How to test it (Prerequisites):

  • Vivaldi Browser (or any chromium based browser. But tested only on Vivaldi snapshot)
  • Enable chrome://flags/#extensions-on-chrome-urls (This extension¬†need to access to chrome urls)
  • Enable chrome://flags/#debug-packed-apps (allow to inspect this extension with dev tools)
  • Copy chromecss folder where you like (I keep it under /Vivaldi/Unpacked/Chromecss/ for convenience)
  • Enable developer mode at vivaldi://extensions/ (Will allow to load the folder in the archive)
  • Load unpacked extension at¬†vivaldi://extensions/
  • Open any chrome:// internal page or reload them to see what is changed.

¬†Just hope chromium don’t remove the flag which make this work.

Grab file and test it ūüôā

Vivaldi MODS [CSS/JS]

Just an article which links several vivaldi mods — as modding section is growing up a lot.

I won’t link everything – almost impossible – but most useful mods found in forum, usually from modding section (sometimes from other forum areas).

Mods are chosen under a “non conflictual criteria”.
So I won’t usually link mods which could break other mods, never tested or broken by recent snapshot updates.
There are several mods: some are just CSS, some others are JS, some are CSS+JS and some others again could be CSS+JS+html with or without a “companion” extension. But you should find any info following the links.
Before start modding, you have to read and understand the pinned thread.
And all the info in the mod thread, or it will likely fail.
Now, we have an additional way to hook mods, if you prefer to avoid fiddle to much with browser.html.
Of course, you’ll still need to hook the injector there.
TIP: Don’t be tempted to hook every mod. Just choose the ones that are most useful to you.




[Bookmark bar text on two rows]

[Bookmark bar mod (text on folder / icon on bookmark)]



[Chromium scrollbars in vivaldi style]

[Chromium pages skin (extension)]

[var(–Color) injector] (will expose vivaldi color themes¬†variables¬†when provided (eg: Linkspanel)



[Change extensions icons with CSS]

[Disable extension buttons (via CSS)] (If you are not using toggle JS mod)

[Extension toggle mod] – [V2 (Show/Hide/Hidden] – [V3 Sets]

[Extensions on footer] (statusbar)



[Footer mod (show as tool menu)]

[Footer on top] (aka known as status bar)



[Move all panel buttons on top]

[Move hide/show panel button to right (if panel is on right)]

[Links Panel]

[Notes panel enhancement]

[Open panel on button mouseover]

[Panel overlay] (if you use floating panel, just use mode above)

[Semi-Transparent background on favicons]

[Session Panel mod]

[Webpanel zoom]



[Transparent speed dial folders]

Scaling mods: speed dial handling is complex and not always work as expected, so I’ll leave the various configurations made below. You can test them ONLY one by one. By default, they rely on a fixed UI scale. Not meant to be dynamic.

[Pure CSS mod to have smaller dials (110% UI)] (Most used mod)

[Pure CSS hack to have smaller dials] (A big css hack to trick vivaldi UI. Built around 50% UI)

[JS/CSS mod for smaller dials] (Another experiment about speed dials)



[Audio Icon Mod] (Only Windows)

[Active tab bold]

[Animated (reload) favicon on tab load]

[Background image visibility on dark backgrounds]

[Flash On tab Title Change]

[Hide tab bar when only one tab is opened]

[Pinned tab with custom indicator (for sidetabs)]

[Pinned tab with content (pin icon)]

[Scroll on top hovering .tab .title]

[Semi-Transparent background on favicons]

[Stacked Tabs mod]

[Tabs loading with color highlight]

[Tabs under urlbar]

[Tabs under bookmarkbar]

[Trash button near add button]

[Two rows of text on tabs] (need v2 RC version)



[Background on urlbar buttons]

[Bookmark button (Urlbar)] (This will actually hide the bookmark bar)

[Change toolbar icons with CSS (via background image)]

[Change toolbar icons with CSS (via SVG path)]

[Hide add-bookmark preview (Urlbar)]

[Hide home button]

[Hide text in padlock by default (show on hover)]

[Incognito Button (Urlbar)]

[Move v button to toolbar] – [Left] – [Right]

[Sync button in urlbar (from tabbar)] (experimental, may not work)



[Alternative find-in-page bar]

[Compact panel sizes] (test)

[Confirm close mod]

[Transitions with window accent]

[Vivaldi://experiment color fix (“theme safe”)]

[Vivaldi focus theme]

[Vivaldi Mod for RGB cases] (sadly I can’t test this)

[White Flash Fix]


[USER FILES MODS] (Page Actions)
These mods are for webpages and should be placed under user_files. You can then access to them with <> icon in footer. Could be erased at any update, so keep a copy somewhere else.

[Follower tabs] (Method 2)

[Increase video player size]

[*TEST*] Vivaldi scrollbar mod [Unpacked extension]

* Follow any instruction to avoid vivaldi hangs or color mess in webpages or other extensions.
* Remove hooks and any change in browser.html if Vivaldi is misbehaving.

* Knowing how to tweak browser.html
* Hook chromecss.js (thanks Sporif for that)
* Hook httpcss.js (which is almost the same, but hook on webpages)
* Place an exclamation mark (!) in body section of the browser.html, so <body> should become <!body> to avoiding hooking unwanted resources from there
* Enable required flag (chrome://flags/#extensions-on-chrome-urls)

Sample of browser.html opened with code editor (I use notepad++)
You should place hooks after bundle.js (look red arrows) without any blank line.
!body [red line] is to prevent hooking background values everywhere (which is really bad).
Then, you have to:

  • Place the vscroll folder in a path like vivaldi\unpack\vscroll;
  • Go to vivaldi://extensions;
    Enable developer mod and point to folder;

You should now see it, restart the browser, and it should work now.


* If you plan to use httpcss.js you’ll lose vivaldi splash screen as you have to disable the whole body in browser.html to make this work correctly.
If you know how I can make the script work without disabling body section please let me know.
* Webpanels scrollbars become transparent (so hook still don’t work there).
* Don’t skip !body step (will cause neverding close to vivaldi).

What is this?
An extension to change the scrollbars on any page, internal or not.

An extension..for scrollbars?
Scrollbars are not part of the browser (Vivaldi) but of the webpage, so they need an extension.

So.. like userscripts extensions (eg. stylus)?
Yes, but it uses less resources as this extension only load the code (custom.css) to change the scrollbars everywhere following vivaldi theme.

So.. it works also on internal pages?
Yes, by default. Activate the need flag (look above).

Download: [Grab it]

I hope will see an easier way to expose v-colors ūüôā
This is just a quite hacky workaround.


OPTIONAL STEPS or “Variants you could make”
Follow these only if you have confidence in editing manifest.json files

If you plan to use this only for chrome:// or vivaldi:// pages, open manifest.json and change this line
"matches": [ "chrome://*/*", "http://*/*", "https://*/*" ],
to this
"matches": [ "chrome://*/*" ],
Then hook only chromecss.js

If you’re not going to do enable that flag, open manifest.json and replace this
"matches": [ "chrome://*/*", "http://*/*", "https://*/*" ],
 with this
"matches": [ "http://*/*", "https://*/*" ],
then load the extension.
Disable any userscript for scrollbars if any (as this match do the same thing).
Then hook only¬†httpcss.js (don’t forget about !body)

Windows 10. A strange beast.

I need windows?
Depends. Some scenarios you might need it — or not.

* You are a gamer.
Software houses are less interested to port their games on linux/mac.
This don’t mean you won’t find cool games, but you know, win is the “default choice” of any PCs.

* Where you work there are only windows machines.
If you can use something different and you know how it works, just do it.

* Devices which work on windows.
Actually, linux should have a lot of wrappers to make the device working.
If not, you are out of luck.

* You have a Windows 10 OEM licence (laptop often have this).
You could still consider a dual boot. Just try not the remove windows partition or you could lose the licence.
Rare, but could happen. It should be saved on UEFI bios now, but be careful is always a good idea.

I don’t play and I don’t want windows 10!
Then try linux. There are lot of distros, just choose one.
If you are even ready to learn some basic commands, it’s quite probably you never have to reformat the whole thing. Just subscribe to the forum for your distro.

Why I can’t stay to windows XP?!
It would be better to avoid. I like XP, I still have it in a virtual machine, but it was released on 2001.
It’s pretty old and outdated nowadays. Security patches and most modern software dropped it.

But get back to windows… =)
Some infos could be old, as usually latest feature update don’t work on my system. Windows mysteries. o_O

Windows downsides:

  • Commercial product (need money to be legally used);
  • Closed source: any mods could be considered EULA violation and cause headaches;
  • Feature updates often are unstable (scroll to see why);
  • 3rd party softwares often mess with windows/programs (if you don’t know how to fix them);
  • Updates mess hard drive partitions (ignore this if you don’t know what they are);
  • They push their modern apps, even if you don’t use them (cortana, onedrive,..); their removal could lead to strange issues. They come back at any feature update, anyway. So is quite pointless removing them.
  • Interface is confusing if you are used to xp or seven.
  • They removed Aero Glass on titlebar. All is flat and sad now.
  • Explorer still need a lot of optimization (still hasn’t dark theme and good cache for big folders).

Windows updates are changed a lot, so here few tips:

  • Preview updates – when you use the update tool – are not a good idea for a stable system.
  • Feature updates are big and require time to be done,¬†so do any work before restart or you have to wait.
  • Service pack don’t exist anymore. Now are called feature updates (but service packs were more stable).
  • Disabling updates/security features is often a¬†bad idea – if you don’t know why are you doing it — but I saw a lot of machines borked by latest feature updates, so generally is also a good idea delay the latest feature updates to allow MS to fix them for most systems (Note: security updates should be¬†always done).
  • Updates could change boot, so if you have more OS (win/linux), better keep them in different hard drives with different boot sectors, or even better different PCs.

Windows updated are changed a lot on their “windows as a service” schema. I’ll do a quick resume:

  • Skip ahead fast ring:¬†Windows Insider version. You’ll get pre-release versions. Nearly untested and highest chance of severe issues.
  • Fast ring: Windows Insider version. Consider it like a windows¬†alpha version. You’ll encounter a lot of bugs, sometimes really bad. I wouldn’t exclude unbooting machines.
  • Slow ring:¬†Windows insider version.¬†Consider it like a windows beta¬†version. You’ll encounter less bugs, some glitches, and sometimes you have to use workaround to do something (regressions).
  • Release ring (+semi annual targeted):¬†Consider it like a release candidate. Some updates come faster but are clearly even less tested.
  • Semi annual build – targeted (ex Current Branch):¬†Windows update default. Most system are fine with this, but sometimes it’s not true. I hope MS is working here.
  • Semi annual build (ex Current Branch Business):¬†Windows update are tested a little more before you get the update. Good compromise between staying updated/working.
  • Long-Term Servicing Channel (ex Long term branch service):¬† Only on Win10 Enterprise. Feature updates are delayed a lot (2-3 years). Home and small business don’t need this at all. Is just for enterprises which need to control any update to avoid issues.

If you prefer a stable system, I suggest staying on semi annual (not targeted).

Safety tip on rings/branches: If you change the channel, you are not able to get back to the original one without reinstalling the whole OS. So, choose it wisely. Instead a feature update from your ring/branch can be removed within 10 days, so keep an eye if everything it’s working fine and go to previous version quickly if it doesn’t ūüôā

Modify system settings: Windows 10 has (still) two settings apps (which is quite confusing and even annoying, I know).¬†The main is called “settings” and it uses ModernUI – while the other, the “legacy” control panel – the one on win7 – it’s a traditional window program – not an app. But probably you have still to use both. For example, admin tools are only in legacy panel. Try to remember any change you do, there. It will save future headaches. The same for any app or driver installed on windows.


Worst bugs I had/seen:

  • Chromium bugs [Win10 1803]: Bug about maximized window (opera fixed before chromium); modern tiles of vivaldi and chrome could be blank at win startup (restart explorer fix this).
  • Gpedit.msc “is closing” [Win10 Pro]:¬†Closing windows require a lot of time, as version 1511 – now obsolete – had this bug.
  • Missing/unworking tiles [start]:¬†Links on start could vanish or stop to work correctly. Remove them and pin again on start. [Windows10 < 1607 ?]
  • Unworking programs:¬†App could stop to work after a major update. Just reinstall it [Windows 10 < 1607 ?]
  • “Faulty” security updates: On rare cases, removing the latest security KB (update) could fix an app. But it should be used as last resource, as is not recommended to remove a security update. [sadly, this is a random – and old – windows issue: last seen on 1511]
  • Modern apps stop to work/are removed:¬†Windows 10 1703. Nasty. And random.
  • Sticky “unused” folder on quick access:¬†This will be on until windows put an option to remove their “user folders”. You can try an hider.

The driver trouble
Windows – and any redmond product – updates itself. Same for most drivers in your machine.

So.. should I update drivers with windows update?
I won’t. Do it only if vendor hasn’t the right driver or if you unsure to what is the right one.

As usually the driver which windows update has, is older than the one you can found on the site of the vendor.

Should I install a driver from windows update if I installed it via vendor site?
No. But Windows will do and¬†you’ll end on a mix of old (from windows update) and new (from site) driver.
In this case, just lock the driver update with this.
If windows update stop to work, try this instead.

Security features
Windows has several security measures. And you should always keep them on.¬†Keep in mind some viruses don’t need admin rights, or can exploit OS to grab them. So you need to be careful always and everywhere ūüėõ

  • Administrator account: Any app can change vital OS parts. And viruses too. Usually only experienced users should use this – but some use people uses standard account, which is slightly more secure.
  • Run as admin: Allow an app/installer to perform admin tasks (often need for an install/upgrade)
  • Standard account: You’re not allowed to change OS vital parts. Or perform any admin task if you don’t use run as admin.
  • Guest account: Similiar to standard, but slightly more restricted. For guests.
  • User account Control(UAC):¬†Every time an action need admin rights, you have to choose allow/unallow. Note: it could be useful only if you read what it says.
  • Windows firewall: Basic protection against intrusion. Keep it on if you haven’t any firewall installed.
  • Windows defender:¬†Protection against viruses. Keep it on if you don’t use third parties antivirus.
  • Secure boot:¬†Prevent using unsigned driver and even some(most) boot sector changes. If you don’t know what it is, keep it on. Some devices – as WindowsRT (arm) – can’t disable it.
  • Smartscreen:¬†Unallow some low level changes.¬†If you don’t know what it is, keep it on.


3rd party security softwares:

Usually, Win10 protection is fine, but if you need more layers of security, you probably are using some of these. These need to be configurated manually to avoid issues with other apps.

Listed from “core security” to “advanced security”. If you are cautious person, you probably won’t need mos of these.

  • Antivirus: Same as Windows Defender, prevent infection.
  • Standalone scanning tools:¬†Best if it has cloud scan (newest engine signature) and multiengine scan (so more chance to detect viruses). Some can scan also browser extensions.
  • Sandbox: Allow to launch an app in a kind of “virtual machine”. So most infections won’t reach your PC.
  • VPN (paid) service: It routes your traffic to stay anonymous, prevent censorship, bypass geolocks and so on. Free services, while they can work, could log you. So they are not really “safe” after all. Some even share IP between users, which is even more insecure.
  • Virtual machine: Virtual OS in your OS. But you’ll be infected if you don’t disable the network on it or if you use sharing folders. So be careful when testing there.
  • Adblocker: Some adblockers can be used system wide. So you need to correctly set it up.
  • Software Firewall:¬†Same as Windows Firewall. It handles incoming/outcoming network traffic.
  • HIPS module: Often called proactive defense. It handles any os process – a kind of superUAC (but often more effective). It’s pointless to use it, if you don’t understand what are saying or their behaviour.
  • Hardware firewall:¬†An hardware firewall to protect your pc. Usually, only need on business or very expert users.
  • Advanced ones: Software or hardware tools which can mitigate with new menaces. Mainly for business.


Risky users habits¬†or “best¬†ways to get an infection on Windows” (most viruses works only here after all).

  • Disabling OS security features without a valid reason;
  • Opening strange attachments in mails. These often has cryptovirus, really bad guys. So always do a scan before opening any attachment and don’t keep them if infected.
  • Install doubt browser extensions/unpacked extensions from untrusty sites (adwares/hijackers viruses).
  • Even some store extensions are infected, so always read their feedback before installing.
  • Install browser plugins¬†from scam sites. Use only real plugin site or your browser addons page to find it.
  • Clicking on¬†scam pages which offer discounts, free things, xxx services or pirated content.
  • Always scan anything which come from p2p platform (torrent/emule) as¬† it could have nasty things inside.
  • Always scan installers from download sites. Or even better download the product from the actual dev homepage if possible.
  • Toolbars/companions bundled in softwares – are usually a good way to get an adware/hijacker. So, never click next > next > next > accept all > when installing things ūüėČ
  • Always scan memory cards/flash drives you put in your pc avoiding to get infected from there.
  • Social login: when you access somewhere with your social credentials. Probably you won’t be infected, but your data could be used for ads, tracking or spam on your email (which is annoying).

Extensions showcase

My favourite extensions for vivaldi.
Most of them are compatible but some can have minor issues – usually due chromium jumps/minor bugs – but still working.
Look also sticky thread about not working extensions.


  • Even the extensions from the store could be infected;
    Chromium now should check and disable them if they are doing something awkard – like injecting ads in tabs – but checking their feedback before install is always a good idea;
  • Any extension take an amount of system resources (CPU/GPU/RAM) and it often¬†impacts browser performances, pages rendering and their contents.
  • Crx packed extension can be opened with any zip program. They’re actually archives.
  • Unpacked extensions basically are extracted crx. In most cases they don’t do auto updates.

The ones I consider “essential” have a > sign before. But feel free to choose yours.
Unlinked ones can be easily found in store while others have a link to download it.

  • _blank
    Paint a purple border on links which will open in a new tab
  • Auto overlay remover
    If you browse sites with nasty overlays.
    Chromium is working on this
  • > Bulk download images(zig)
    Mass images downloader
  • Chrono download manager
    An alternative to the stock chrome://downloads (with more options) or the vivaldi download panel.
  • Cookie autodelete
    Handle cookies so you can decide what keep and what remove for any site.¬†Won’t clean local storage. Hope Vivaldi will fix this, but not easy I guess.
  • Colorzilla
    Color picker. I hope this will be native.
  • Death to _blank
    Remove all redirects but slow down the browser.
  • > Force background tab
    It will open any tab in background when on.
  • > Flash video downloader
    Used to work, but latest versions don’t work as expected and the older won’t work forever, I fear.
  • > Floating player
    Open video streams in a popup.
  • I don’t care about cookies
    Block annoying “this site use cookies” in European countries where any site should say if they are using cookies.
  • Imagus
    Image preview on mouse hover.
  • > Imtranslator
    A complete translator with useful options.
    A better alternative to G-translate which has issues.
  • MEGA
    Used as workaround to download big files from their servers. Bug was fixed ūüôā
  • > OneTab –¬†send tabs – even pinned/stacked – to only one showing a page with their links.
    Help to shrink cpu/ram usage while keeping the tabs in place.
  • > NanoAdBlocker / UblockOrigin
    Poweful adblockers. Read here if you have popup issues
  • > NanoDefender
    Companion of NanoAdBlocker. Unlock sites which locks adblockers.
  • > Pagezipper
    Auto load next page (work on most sites)
  • Popup blocker (strict)
    Handle popups and redirects.
    Could need whitelisting sites you need.
  • > Popout video player
    As floating player, but seems to be more functional.
    Issues on latest snapshot(?)
  • > Recursive bookmark sorter
    The only way to auto sort bookmark bar in A/Z order for both folders and files.
    Workaround for chromium/vivaldi missing feature. Need sorting on “manual”
  • Skip redirects
    In test, no particular impacts of performance. Just skip redirects.
    You might need whitelisting sites you use often.
  • Simple ext manager
    Button for a quick access to all your extensions.
  • > Scriptjager
    Scriptblocker by an_dz. As Umatrix but lighter and easy to use.
  • Smart https
    Load sites in secure protocol or fallback in http.
    Useful but heavy on ram. Some sites could show a garbaged https page (as they are still on http)
  • Stylus/stylebot
    Change css style of webpages (both are fork of stylish)
  • The great discarder/suspender
    Discard/suspend (unload/hibernate) tabs after “x” time with regex support.
    Newer chromium actually discard tabs on low ram/high cpu but don’t allow to choose on which sites.
  • Tab count
    Says how tabs/window did you opened in its button.
    Worth saying also Vivaldi window panel also do this.
  • Tree tabs
    Webpanel which show your tabs in tree style.
  • > Tumblr collage
    A faster way to browse user galleries/archives.
  • Umatrix
    Powerfuil scriptblocker. Read here if you have popup issues.
  • > User agent switcher for chrome
    Often used when vivaldi is mis-detected for a site fault.
  • > Vivaldi forum mod (by luetage)
    Collection of forum mods/themes if you come here often.
  • Video autoplay blocker
    Prevent autoplay of html5 videos: it acts like the old “click to play”.
    Chromium is working on this.

Command line switches

Chromium switches have to be appended to a vivaldi shortcut after vivaldi.exe (or your OS format).
Most of them depend on your OS and are just for debugging, (web)developing or modding the browser, while some others are meant to be used only on chrome Рthey need specific google API/keys to work Рso not meant for chromium based browser, like our Vivaldi.
Some command lines can be enabled also by a flag, and it’s what I prefer whenever is possible as the option is directly “stored” by the browser and not loaded via a shortcut.

Now, some useful switch that can be used in Vivaldi.

Enabling some features:

  • –save-page-as-mhtml (provided also as a flag)
  • –show-cert-link (provided also as a flag) Chromium now does it by default
  • –enable-devtools-experiments¬†Style devtool. Should work on chromium64 or newer.
  • –enable-logging –v=3 –vmodule=metrics=2:¬†Windows ONLY. Place a log in vivaldi profile and a debug window at vivaldi startup. v=0/v=1/v=2 will do a huge txt log.
  • –enable-logging –v=3:¬†Same. Vmodule parameter seems to be necessary on win only.
  • ¬†–process-per-site – This will lower RAM usage but it could increase hangs if you use a lot of tabs from the same site – as it will use a process for each site.
  • –args –ignore-certificate-errors – Not meant to be used¬†on your main vivaldi shortcut as it’ll¬†*always* allow any not secure content from *anywhere* – it’s a risky workaround for few sites/platforms, but it will lower your security alot¬†and could expose users/certificates on machine to data theft and to be hacked. You had be warned.¬†Use it wisely. And only for sites you really, really trust.

Bonus tip: Chromium don’t allow anymore to bypass invalid certificates¬†(“proceed anyway” as firefox does).
If you can’t access to your platform/internal site due an old certificate you can try to type
to access the site.
Keep in mind this should be used only on trustworthy sites or you probably get a malicious certificate placed in your operating system (which is bad) and will probably compromise the machine security.


Allow inspecting UI and extensions

  • –remote-debugging-port=9222 – Then you can inspect tabs/extension/UI at http://localhost:9222/ page.
  • –debug-packed-apps¬†(provided also as a flag)
  • –silent-debugger-extension-api


Cache specific

  • –disk-cache-dir=”D:\Temp\Vivaldi” – Move cache in specific folder. I use it for moving cache outside my SSD drive(C:) while keeping Vivaldi on SSD (for performance reason).
  • –disk-cache-size=1073741824 – Set cache size in bytes (here is ~1GB)


Some experiments for gpu workarounds/enhancement. Couldn’t work at all.¬†As chromium often have troubles on several GPU I don’t advise to test them (they seems to be a placebo).¬†

  • –enable-features=CheckerImaging
  • –enable-native-gpu-memory-buffers
  • –enable-zero-copy¬† (provided also as a flag)

Vivaldi Switches

These switches are meant to be used in urlbar and they allow the access to some advanced function of the chromium core engine.

While I tested Рand keeping on Рmost of them, some of these are experimental features and could degrade your Vivaldi performance/stability/security when misused. Under particular scenarios could also hang the entire chromium process (dead birds) and so Vivaldi.

The Chrome:// strings usually lead to a chromium core page, while Vivaldi:// strings usually triggers a vivaldi UI page but…

It’s not always true: for example ://flags lead always to same page, while ://settings could lead to chromium settings (if used with chrome) or to vivaldi settings(ALT+P).

Another note: chrome:// and vivaldi:// urls are always converted to vivaldi:// even if the place is different. This is already known, but not fixed yet. May change anytime.

Such switches are not treated as URLs so you have to highlight them and do “go to” – or even better, bookmark the ones you need ūüėČ

Some of these switches can also changed via command line.


Safe Ones (flags which shouldn’t cause issues).

  • chrome://flags/#PasswordImport
  • chrome://flags/#PasswordExport
  • Allow import/export password in unprotected csv¬†Partially broken in chromium 59-62. You’ll find more info/help¬†here. at chrome://settings/passwords page.
  • chrome://flags/#save-page-as-mhtml¬†– Enable mhtml (archived html, single file for whole page) in Vivaldi “save as” screen.
  • chrome://apps¬†–¬† Allow to see apps currently installed in vivaldi. Note that chromium deprecated apps support for any platform except chromeOS.
  • chrome://settings/autofill – Handle and see autofill options.
  • chrome://settings/passwords/¬†– Vivaldi UI don’t allow yet to see passwords. Use this if you forget your pass for a stored site.
  • chrome://flags/search#show-cert-link¬†– Since chromium 60, you can see certificate/details on site settings (icon in urlbar).¬†Chromium finally do it by default
  • chrome://downloads – Open chromium download “manager” (vivaldi has it own in the panel).
  • chrome://extensions – List of all your extensions.
  • chrome://gpu – See how chromium is using gpu accelerations.
  • chrome://history-frame –¬†Open bookmarks with chromium layout (material design) as a tab
  • vivaldi://bookmarks – Open vivaldi bookmarks as tab.
  • vivaldi://history – Open vivaldi history as tab.


Risky Ones (flags for expert users)

  • chrome://flags – lead to chromium core flags – experimental features or advanced ones (think it like an about:config).
  • chrome://settings/ – Access to all chromium core settings page. Don’t abuse editing from here. And don’t enable sync ever (could break profile).
  • chrome://settings/?search=background – Disable background apps at exit. It helps to fully close the browser, and could reduce issues (if you are not using background apps)
  • chrome://settings/?search=hardware – If you have issues with videos – try check/uncheck gpu acceleration. Could reduce perfomances but fixes problems on some platforms (mac, and sometimes windows).
  • vivaldi://settings/ – Open vivaldi settings(alt+p) in tab.
  • chrome://about – Show all switches while..¬†¬†
  • vivaldi://about – Show the about page
  • chrome://flags/#enable-color-correct-rendering¬†– off seems to represent better colors for some rigs.
  • chrome://net-internals/#sockets¬†– See the stats of chromium core, flush socket pools (it helped me once), check cache settings and so on.
  • chrome://flags/#debug-packed-apps – Allow inspecting extensions code (html/css/js)
  • chrome://flags/#automatic-tab-discarding¬†– Discard (unload) tabs (more often?) when memory usage is too high. They’ll be reloaded when clicked
  • chrome://flags/#fill-on-account-select – You have to click on user/password box to fill with your credentials.¬†Chromium password manager could leak data and it’s working on fixing it so probably this flag will disappear soon.
  • chrome://discards – stats about discarded tabs.
  • chrome://flags/#enable-zero-copy – Enable the zero-copy rasterizer for faster rendering. While is available on any platform, chromium team says it¬†works in chromeOS only and sometimes on Macs. (So it could be a placebo)
  • chrome://flags/#allow-insecure-localhost¬†– It allows to load invalid local certificates if you need them. This will lower your security.
  • chrome://flags/#enable-scroll-anchoring¬†– Worth trying if the scrolling is really bad.
  • chrome://flags/#smooth-scrolling – If you experience lag scrolling try to enable this.
  • chrome://flags/#lcd-text-aa¬†– Could help on some scenarios where fonts are blurred (it happens often on windows OS).
  • chrome://flags/#enable-md-extensions¬†– Enable Material Design for extensions page. It had some issues on previous chromium versions.
  • chrome://flags/#autoplay-policy – New chromium 61 policy to prevent autoplay of html5 streams (probably don’t working yet).
  • chrome://flags/#load-media-router-component-extension
    chrome://flags/#media-remoting¬†– Disable these, if you don’t use chromecast/multicast
  • chrome://flags/#extensions-on-chrome-urls – it¬†appends css/js to chrome:// pages: [guide] [forum thread]
  • chrome://flags/#enable-parallel-downloading – Experimental feature to fasten chrome downloads.¬†I guess this should be supported by the server.
  • chrome://flags/#ignore-gpu-blacklist – If chromium blacklist your GPU acceleration but you think will work, you can try enabling this.
  • chrome://flags/#enable-experimental-canvas-features –¬†Could speed up the rendering of images and contents.
  • chrome://flags/#enable-fast-unload –¬†Could speed up the tabs loading/unloading
  • chrome://flags/#enable-gpu-rasterization – Could speed up pages loading
  • chrome://flags/#gpu-rasterization-msaa-sample-count –¬†Could enhance GPU rasterization (set to 16)
  • chrome://flags/#enable-resource-prefetch –¬†Prefertch resourche to speed up browsing
  • chrome://flags/#default-tile-width | chrome://flags/#default-tile-height –¬†Ram specific. Is 1024 for >4gb
  • chrome://flags/#enable-simple-cache-backend –¬†Use experimental OS function to HTTP cache.
  • chrome://flags/#disable-background-video-track – Will pause videos when in background.
  • chrome://flags/#num-raster-threads – Use more rasters (set to 4)
  • chrome://flags/#memory-ablation – Will take more ram to speed up browsing. (set according your ram size)
  • chrome://flags/#enable-font-cache-scaling –¬†Will reuse cached fonts for faster browsing.
  • chrome://flags/#enable-nostate-prefetch – Wil improve loading time prerendering resources (set to enable prerender)
  • vivaldi://experiments/¬†– Experimental Vivaldi features. Don’t try them in your main profile – use a standalone snapshot for try them ūüėČ