Windows 11 works best with default size scrollbar so use: [read more]
Use userContent-WallpaperEdition-Windows11DefaultScrollbar.css or userContent-Windows11DefaultScrollbar.css
-
❗Rename the chosen template files to
userChrome.cssanduserContent.css. -
Enable
toolkit.legacyUserProfileCustomizations.stylesheetsinabout:configfor your custom themes to work. -
You can find your profile folder by writing
about:supportin URL bar and usingOpen folderinProfile foldersection. -
File Structure (Create
chromefolder inside your main profile folder if it doesnt exist):📂
.../chrome/userChrome.css📂
.../chrome/userContent.css📂
.../chrome/image/📂
.../chrome/window/ -
For blur to work in new tab homepage [Wallpaper edition].
- [It's now Enabled by default] - Go to
about:configand enablelayout.css.backdrop-filter.enabled(change totrue).
- [It's now Enabled by default] - Go to
-
For blur style search dropdown and bookmarks bar to work [Doesnt work for now since firefox changed it].
- [It's now Enabled by default] - Go to
about:configand enablelayout.css.backdrop-filter.enabled(change totrue).
- [It's now Enabled by default] - Go to
20/07/2022 > Changed wallpaper on a blank loading screen to a solid dark color for the "userContent-WallpaperEdition".
19/07/2022 > Added new theme with background wallpaper and blur effect.
10/06/2022 > Fixed padding in fullscreen after recent version changes.
14/05/2022 > Fixed after an update broken popup menu background color for 100.x versions of firefox.
13/02/2022 > Added new optional file for default size scrollbar. The color stays dark. Works best with new Windows 11 scrollbar.
Use "userContent-Windows11_DefaultSizeScrollbar.css" file and rename it to "userContent.css".
Old Firefox versions [read more]
One line config: 'userChrome-ONE-LINER.css' For Firefox versions below 89.0.0
Tested versions [read more]
Last Tested on:
-- Default Dark Theme
NEW PROTON
-- Windows 10/11 - 106.0.1 / 105 / 104.0.1 / 102.0.1 / 102.0 / 101.0 / 100.0 / 99.0.1/ 98.0 / 97.0.1 / 96.0.3 / 96.0 / 95.0 / 94.0.1 / 93.0 / 91.0.2 / 90.0.1 / 90.0 / 89.0.1 / 89.0.0
Old Firefox Versions:
-- Windows - 73.0.1 / 74.0 / 74.0.1 / 75.0.0 / 77.0.1 / 80.0 / 84.0.1 / 85.0.0
-- Linux - 74.0.1 | Default Dark ThemeSources [read more]
Source for Backdrop filter:
https://www.reddit.com/r/FirefoxCSS/comments/ddi4dc/testing_the_backdropfilter_in_the_url_dropdown/
Source for Windows Control buttons:
https://github.com/aminomancer/uc.css.js/tree/master/resources/window










