What Does the Add-on Do? This add-on dynamically adjusts the Firefox theme to match the appearance of the website you are viewing, similar to the tab bar tinting feature in Safari on macOS. Works Well With

Incompatible With

Removing the Shadow at the Bottom of the Toolbar To remove the thin shadow cast by web content onto the browser toolbar, navigate to Settings (about:preferences) and disable “Show sidebar” in the “Browser Layout” section. Alternatively, add the following code to your CSS theme:

#tabbrowser-tabbox, .browserContainer {
box-shadow: none !important;
}

Customising Colour Transitions Firefox natively applies a transition effect to tab bar colour changes. To disable this behaviour and allow Adaptive Tab Bar Colour (ATBC) to update colours instantaneously, add the following code to your CSS theme:

:root {
--ext-theme-background-transition: none !important;--inactive-window-transition: none !important;
}

Alternatively, you may prefer smooth colour transitions for the tab bar. As this cannot be natively supported due to technical limitations, add the following code to your CSS theme (thanks to @Moarram):

#navigator-toolbox, #TabsToolbar, #nav-bar, #PersonalToolbar, #sidebar-box, .tab-background, .urlbar-background, findbar {
transition:
background-color 0.5s cubic-bezier(0, 0, 0, 1), border-color 0.5s cubic-bezier(0, 0, 0, 1) !important;
}

To enable smooth colour transitions in the Sidebery UI, add the following code to the Sidebery Style Editor (thanks to @MaxHasBeenUsed):

.Sidebar, .bottom-space {
transition: background-color 0.5s cubic-bezier(0, 0, 0, 1) !important;
}

Compatibility with Third-Party CSS Themes A third-party CSS theme works with Adaptive Tab Bar Colour (ATBC), as long as they use Firefox’s standard colour variables (e.g. --lwt-accent-color for the tab bar colour). This is an example of an ATBC-compatible CSS theme. Title Bar Buttons on Linux with GTK Theme Firefox’s titlebar buttons may revert to the Windows style. To prevent this, open “Advanced Preferences” (about:config) and set widget.gtk.non-native-titlebar-buttons.enabled to false. (Thanks to @anselstetter) Safety Reminder Beware of malicious web UIs. It is important to distinguish between the browser UI and the web UI. For further information, please refer to The Line of Death. (Thanks to u/KazaHesto) Feel free to star this project on GitHub: https://github.com/easonwong-de/Adaptive-Tab-Bar-Colour

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