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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.
- Fixed and updated Split View Window frame, removed the white lines in the middle.
- Fixed
mod.main.window.frame.style-1(and.style-2) window frame mod to work better with Split View.
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).
- 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).
Enablemod.enable.browser.border-and-shadowinabout: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.
Enablemod.main.window.frame.style-1ormod.main.window.frame.style-2inabout:config
- Improved and corrected Vertical tabs size including pinned tabs.
Added an option for more compact vertical tabs. Enablemod.compact.vertical.tabsinabout:config
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Fix window control buttons
min-max-close_buttons.cssmod when window resized to minimal in vertical tabs mode. -
Add some of the missing mods to documentation for how to enable it. [Jump]
Likemod.disable.scrollbar.in.vertical.tabs,mod.centered.tabs,mod.searchBox.focus.outline.enable,firefoxcss.disable.tab.preview.panel.fullyetc.
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" inabout:config
Changes made to userChrome.css file since v2.40.






