README

  FlexFox


 
 
 
 




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FlexFox is a Firefox userChrome theme focused on maximizing usable screen space while preserving accessibility. Toolbars and sidebars automatically collapse when not in use and expand as overlays without shifting page layout. When Sidebery is enabled, native tabs are automatically hidden to maintain a single tab system, avoiding redundant interface elements. It supports extensive customization through preferences and is designed as a flexible foundation for different browsing workflows.

!FlexFox v6.5  

 [!IMPORTANT]

  Changed Firefox's Expand sidebar on hover setting? Disable it. FlexFox requires this option to remain unchecked. (Guide)
  Upgrading from a version earlier than v6? Remove all legacy styles from the Sidebery Styles Editor. (Guide)
  Recommended setup: Use Firefox's vertical tabs mode, ideally together with Sidebery, for the most complete feature set and best overall experience.

 🎬 Feature Showcase Video

Watch the v6.5 feature showcase:

https://github.com/user-attachments/assets/64be5a0e-f97e-4257-aac8-63245791d07b

For better video quality, watch on YouTube:

YouTube Link

 🆕 What's New

🦊 Latest: v7.1.2 — See Full Changelog for details.



 ✨ Features

 Auto-collapsing tabs, toolbars, and sidebars.
 Expands as an overlay without shifting webpage content or causing layout jumps.
 Quickly hide or show tabs and toolbars using keyboard shortcuts or toolbar buttons.
 Automatically hides native tabs when Sidebery is enabled to maximize screen space.
 Optional translucent blur effects for menus, panels, and address bar popups.
 Support for Windows Mica and custom browser wallpapers.
 11 built-in accent colors with full light and dark mode support, compatible with any Firefox theme.
 Customizable icons for sidebar buttons, bookmark folders, bookmark stars, window controls, and more.
 Optional auto-hide for toolbar buttons and window controls, keeping the interface minimal while remaining easily accessible.
 Extensive appearance customization through Firefox preferences, including:
   Rounded or squared UI element corners
   Menu spacing
   Webpage content margins and borders
   Flat or embossed address bar styles
   Tab borders and background colors
   Animation and transition effects
 Customizable pinned tab layout and area height.
 Floating search box.
 Support for custom style overrides to personalize or extend the default theme.
 Additional quality-of-life enhancements, including:
   Preventing white flashes while pages are loading
   Displaying the total number of open tabs on the "List All Tabs" button
 Browsing experience improvements, including:
   Enhanced active tab visibility for easier navigation between related tabs
   Grid-based pinned tabs that save space, support large pinned tab collections, and prevent tab shifting when sidebars expand, reducing mouse repositioning
 Minimal performance overhead.

 ⚙️ Options

FlexFox leaves the native Firefox interface largely u

Top issues

Discussions

Latest release

🦊 v7.1.2

 [!IMPORTANT]
 v7.0.0 introduced several new features and breaking changes. If you missed its release notes, you can read them here:

 English | 日本語 | 简体中文

 Improvements

- Moved the URL bar's animated gradient border outward for more spacing.
- Added menu icons for Mini Window (Firefox 160) and Tab Groups (Firefox 161). Bug 2074676 Bug 2048790 Bug 2063723
- The URL bar search mode switcher now follows icon auto-hide settings after Firefox 161 changes. Bug 2085310

 Breaking Changes

- Git installation and update scripts now require Git 2.27 (released June 1, 2020) or