What Does the Add-on Do? While you browse the web, this add-on changes the theme of Firefox to match the appearance of the website you are viewing — just like how macOS Safari tints its tab bar. Works Well With:

Incompatible With:

Firefox versions older than 112.0 (released in April 2023)
Adaptive Theme Creator
Chameleon Dynamic Theme
VivaldiFox
Envify
and any other add-on that changes the Firefox theme

If You Want to Remove the Shadow Beneath the Toolbar: To remove the thin shadow cast by the web content onto the browser toolbar, go to Settings (about:preferences) and turn off Show sidebar under the Browser Layout section. Alternatively, you can use a CSS theme. For more information, see GitHub issue #155. If You Want to Turn On Smooth Colour Transition: Due to technical limitations, smooth tab bar colour transition is not natively supported. However, you can use a CSS theme to achieve this effect. For more information, see GitHub issue #43. If You’re Using a CSS Theme: A CSS theme can work with ATBC (Adaptive Tab Bar Colour) when system colour variables are used (e.g. --lwt-accent-color for tab bar colour). This is an example of an ATBC-compatible CSS theme. If You’re Using Linux with a 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: Please distinguish between the browser’s UI and the web UI. For more information, see 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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