v2.46- Tested on Firefox v150

📦 Latest Full Repository .zip download | 📦 Release v2.46.zip download

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v2.46 • 24/04/2026 • Tested on Firefox v150.0

• Fix New tab/homepage Customization menu

Preview

v2.45 • 24/04/2026 • Tested on Firefox v150.0

• Fix Custom firefox theme compatibility, including some extra mods.

Preview

• Popout bookmarks bar behavior changes.
• Toolbar spacing changes between tabs and searchbar.
• Browser content border and shadow enabled by default now. To disable use "mod.disable.browser.border-and-shadow" in about:config.
• push_bookmarks_bar_on_hover.css improvement.
• transparent_bookmarks_bar.css is centered by default.
• Icons in main menu updated.
• url_bar_no_border.css fix.
• Fix search bar icon behaviour when websites arent trusted.

To Update You can Download userChrome and userContent files if you dont care about other mods.

v2.41- Tested on Firefox v149

📦 Latest Full Repository .zip download | 📦 Release v2.41.zip download

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v2.41 • 26/03/2026 • Tested on Firefox v149.0

• Fixed and updated Split View Tab design, including Vertical tabs mode.

Preview

• Fixed and updated Split View Window frame, removed the white lines in the middle.

Preview

• Fixed mod.main.window.frame.style-1 (and .style-2) window frame mod to work better with Split View.

Preview

Will need to go through some of the mods to fix compatibility with latest firefox changes.

v2.40 • 25/03/2026 • Tested on Firefox v149.0

• Fixed rounded border around browsing window frame when using vertical tabs (Firefox rounds it by default).

Preview

• Added an option to enable the border with shadow as default Firefox behavior (Firefox has a small bug where dynamic on hover vertical tabs have a line visible when opened).
  Enable mod.enable.browser.border-and-shadow in about:config

Preview

• Fixed border in mod popout_bookmarks_bar_on_hover.css.
• Fixed Firefox uncentered tab close button in vertical mode.

Preview

• Added new Window Border frame mod with two different styles.
  Enable mod.main.window.frame.style-1 or mod.main.window.frame.style-2 in about:config

Preview

• Improved and corrected Vertical tabs size including pinned tabs.
  Added an option for more compact vertical tabs. Enable mod.compact.vertical.tabs in about:config

Preview

• Fix window control buttons min-max-close_buttons.css mod when window resized to minimal in vertical tabs mode.

• Add some of the missing mods to documentation for how to enable it. [Jump]
  Like mod.disable.scrollbar.in.vertical.tabs, mod.centered.tabs, mod.searchBox.focus.outline.enable, firefoxcss.disable.tab.preview.panel.fully etc.

v2.31 • 25/03/2026 • Tested on Firefox v149.0

• Fix Search bar buttons (left side) on hover. Firefox v149 combined cookies and connection security button into one button with now forcing "browser.urlbar.trustPanel.featureGate" in about:config.
  If you want to always show the buttons you can enable "mod.search.info.buttons.show.always" in about:config

Preview

Changes made to userChrome.css file since v2.40.

v2.40 - Tested on Firefox v149

📦 Latest Full Repository .zip download | 📦 Release v2.40.zip download

📦 Easy Install Script by Alan-Kuan download - instructions

🚩 Report issues or suggestions

v2.40 • 25/03/2026 • Tested on Firefox v149.0

• Fixed rounded border around browsing window frame when using vertical tabs (Firefox rounds it by default).

• Added an option to enable the border with shadow as default Firefox behavior (Firefox has a small bug where dynamic on hover vertical tabs have a line visible when opened).
  Enable mod.enable.browser.border-and-shadow in about:config

• Fixed border in mod popout_bookmarks_bar_on_hover.css.
• Fixed Firefox uncentered tab close button in vertical mode.

• Added new Window Border frame mod with two different styles.
  Enable mod.main.window.frame.style-1 or mod.main.window.frame.style-2 in about:config

• Improved and corrected Vertical tabs size including pinned tabs.
  Added an option for more compact vertical tabs. Enable mod.compact.vertical.tabs in about:config

• Fix window control buttons min-max-close_buttons.css mod when window resized to minimal in vertical tabs mode.
• Add some of the missing mods to documentation for how to enable it. [Jump]
  Like mod.disable.scrollbar.in.vertical.tabs, mod.centered.tabs, mod.searchBox.focus.outline.enable, firefoxcss.disable.tab.preview.panel.fully etc.

v2.31 • 25/03/2026 • Tested on Firefox v149.0

• Fix Search bar buttons (left side) on hover. Firefox v149 combined cookies and connection security button into one button with now forcing "browser.urlbar.trustPanel.featureGate" in about:config.

If you want to always show the buttons you can enable "mod.search.info.buttons.show.always" in about:config

Changes made to userChrome.css, min-max-close_buttons.css, popout_bookmarks_bar_on_hover.css files since v2.31.

v2.31 - Tested on Firefox v149

📦 Latest Full Repository .zip download | 📦 Release v2.31.zip download

📦 Easy Install Script by Alan-Kuan download - instructions

🚩 Report issues or suggestions

v2.31 • 25/03/2026 • Tested on Firefox v149.0

• Fix Search bar buttons (left side) on hover. Firefox v149 combined cookies and connection security button into one button with now forcing "browser.urlbar.trustPanel.featureGate" in about:config.

If you want to always show the buttons you can enable "mod.search.info.buttons.show.always" in about:config

Changes made only to userChrome.css file since v2.30.

v2.30 - Tested on Firefox v148.0

📦 Latest Full Repository .zip download | 📦 Release v2.30.zip download

📦 Easy Install Script by Alan-Kuan download - instructions

🚩 Report issues or suggestions

v2.30 • 11/12/2025 • Tested on Firefox v148.0

• Fix Search box in new tab/hometab for Firefox v148.
• Fix Pinned Shortcut icon from always being showed to only show on title hover.
• Fix colors for Weather Widget for different dark & light color scheme modes. Fix context menu colors.

• Changed "Customize this page" button to minimal design.

• Fix settings menu background colors.
• Fix private window search box colors.
• Fix wallpaper-edition.css. Remove unnecessary style 1. Remove my forced background because you can change it yourself now.
• Fix spill-style-part2-file.css for Firefox v148.
• Fix browsing window background color when opening new page (blank/loading/flash).
• Fix Tab Groups menu corner padding/margins.
• Change Right Click to use Windows 11 mica effect. To disable it change widget.windows.mica.popups to 0 in about:config.

Changes made in userContent.css, wallpaper-edition.css, spill-style-part2-file.css, userChrome.css files.

v2.20 - Tested on Firefox v146.0

📦 Latest Full Repository .zip download | 📦 Release v2.20.zip download

📦 Easy Install Script by Alan-Kuan download - instructions

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v2.20 • 11/12/2025 • Tested on Firefox v146.0

• Fix New Tab customization menu for wallpaper selections for v146. Remove blur for secondary menu (first page still has it) as it's no longer properly working. Add transition and change design a bit (Recent).

preview animation

preview change

• Remove mobile phone button from new tab. Could be already hidden by Firefox but to be sure force hide the lingering code. (Commits on Nov 26, 2025).
• Fix tab background color in private browsing mode. Only for those who Firefox targeted with new config preference (browser.privatebrowsing.felt-privacy-v1) (Commits on Nov 24, 2025)
• Private page tab switch background flashing color fix. Only for those who Firefox targeted with new config preference (browser.privatebrowsing.felt-privacy-v1) (Commits on Nov 24, 2025)

Changes made only in userChrome.css and userContent.css files.

v2.19 - Tested on Firefox v143.0

📦 Latest Full Repository .zip download | 📦 Release v2.19.4.zip download

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v2.19.4 • 07/11/2025 • Update fix

• v2.19.3 web apps buttons fix caused regression in normal vertical tabs mode. Both should be fixed now.

v2.19.3 • 09/10/2025 • Update fix

• Fix web apps window control buttons for default OS controls.

v2.19.2 • 25/09/2025 • Update fix

• Fix search mode switcher color and border radius [code].

v2.19.1 • 22/09/2025 • Update fix

• Fix searchbar in extra mods for firefox v143.0 (transparent and border mods),

v2.19 • 17/09/2025 • Tested on Firefox v143.0

• Fix web apps window control buttons for min-max-close_buttons.css mod [code].
• Fix searchbar for firefox v143.0 [code].

v2.18 - Tested on Firefox v141.0

📦 Latest Full Repository .zip download | 📦 Release v2.18.zip download

📦 Easy Install Script by Alan-Kuan download - instructions

🚩 Report issues or suggestions

This is probably the last update before v3.0 unless firefox
breaks something again.

v2.18 - 23/07/2025 - Tested on Firefox v141.0

• Remove empty space after Pinned tabs again after v141.0 update (recent).
• Fix Windows thicker_control_buttons.css mod (still need to check on windows 10) (recent).
• Fix new tab page layout for Firefox v141.0 (recent).
  These configs were removed by firefox and not used anymore
  (browser.newtabpage.activity-stream.newtabLayouts.variant-a)
  (browser.newtabpage.activity-stream.newtabLayouts.variant-b)
• Fix MacOS min-max-close_buttons.css mod after v141.0 update (still need to check on windows 10) (recent).
• Removed outdated MicaForEveryone files as it wont be needed anymore. I may add quick transparency mod before v3.0 but not sure.
• Fix switch to tab button inside search dropdown (Jul 14, 2025).
• Fix white_github_icon_in_bookmarks.css, should show correct in bookmark folders #205 (Jun 4, 2025)
• Hide new tab shortcuts pin after new layout changes. Hover and hold over the title/text to see if the shortcut is pinned (May 28, 2025).
• cleaner_extensions_menu.css Style 2 from v3.0, fully reworked (May 27, 2025):
  Read configure-preferences.txt for configuration or you can see in readme here with previews.
  Supported configs:
  • mod.number.of.extensions.in.a.row
  • mod.extensions.menu.extention-icon.size
  • mod.hide.manage-extensions.button
  • mod.disable.extensions-menu.separator
  • mod.hide.faded-extensions.inside.extensions-menu

• Add support for new search engine mode switcher (May 27, 2025). If you want to use old search engine switcher disable in about:config "browser.urlbar.scotchBonnet.enableOverride".

• Added Issue and feature report template for github.

Known issue:
Wallpaper style themes mod.

v2.17 - Tested on Firefox v137.x

📦 Latest Full Repository .zip download | 📦 Release v2.17 .zip download

📦 Easy Installer Script made by Alan-Kuan download - instructions

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v2.17 - 01/04/2025 - Tested on Firefox v137.x

• Fix all files to support firefox v137 code changes.

Firefox v140.x Download latest full

📦 Latest Full Repository .zip download

v2.16.1 - Tested on Firefox v136.x

📦 Latest Full Repository .zip download | 📦 Release v2.16.1 .zip download

📦 Easy Installer Script made by Alan-Kuan download - instructions

🚩 Report issues or suggestions

v2.16.1 - 31/03/2025 - Tested on Firefox v136.x

• fix tabs speaker/audio icon color on hover (only userChrome file changes).

v2.16 - 31/03/2025 - Tested on Firefox v136.x

• Linux min/max/close buttons code rewrite to fix duplicated buttons in vertical tabs mode.
  New mod folder, added setup readme file for changing order and location of buttons through about:config. No more manual padding adjustment needed if only few/one button visible.
• Minor context menu (right click) changes for Linux.
• New tab shortcut button (plus sign) size fixed for new/test Firefox layout.
• Fix sidebar/verticalTabs background color when using Auto Firefox Theme. To use custom theme accent colors for sidebar/verticalTabs enable (mod.custom.firefox.theme.color.fix in about:config).
• Hide extension text inside url bar by default until clicked (#193).
  
  
  Added mod.hide.extension.url.icon about:config preference to hide the icon too if needed.
• Added an option for centered tabs. Enable mod.centered.tabs in about:config (#192).
• Make tab group work correctly (#190). Not fully adapted/tested as it's not fully implemented into stable version.

Updated files this release:

• UserChrome.css
• UserContent.css
• New mod folder "MacOs style buttons for LINUX"

Uploaded userChrome and userContent separately who don't want to download full folder.