Bugzilla

**Note**
* Background color of Sidebar special tabs does not switch when changing themes, when specific themes are installed. This happens when having Chatbot AI opened and switching from a light theme to a dark theme. The background only changes after going through the other tabs (Tabs from other devices, History, Bookmarks).

**Found in**
* Release v140.0.1

**Affected versions**
* Release v140.0.1
* Release v140.0

**Unaffected versions**
* Beta v141.0b2
* Nightly v142.0a1

**Tested platforms**
* Affected platforms: Windows 10, Ubuntu 22, MacOS 15
* Unaffected platforms: none

**Steps to reproduce**
1. Enable Sidebar
2. Install the following themes:
a. https://addons.mozilla.org/en-US/firefox/addon/colorful-abstract-neon/
b. https://addons.mozilla.org/en-US/firefox/addon/visionary-balanced/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search
c. https://addons.mozilla.org/en-US/firefox/addon/activist-balanced_/
3. Open the AI chatbot screen from the Sidebar.
4. Load about:addons
5. Open the AI chatbot screen from the Sidebar.
6. Switch from a dark theme to a light one or vice-versa

**Expected result**
* The AI Chatbot screen background color switches from dark to light or vice-versa, as intended.

**Actual result**
* The AI Chatbot screen background color does not switch from dark to light or vice-versa.
* The Tab background does not switch when focusing Tabs from other devices, History, but it will switch to the correct background color when switching to Bookmarks tab.

**Regression range**
* It does not occur in the later versions: Beta v141.0b2, Nightly v142.0a1.

**Additional notes**
* The issue only reproduces if the mentioned themes are installed.
* The issue reproduces with both Horizontal or Vertical Tabs enabled.
* The issue reproduces when switching between the main Dark and Light Themes (if the mentioned themes are installed).
* The issue seems related to bug 1971487.
* Demo: https://drive.google.com/file/d/1rrekLJgyhk23uu9XEhrs7Fo_4jp0dxXH/view?usp=sharing

**Note**
* Background color of Sidebar special tabs does not switch when changing themes, when specific themes are installed. This happens when having Chatbot AI opened and switching from a light theme to a dark theme. The background only changes after going through the other tabs (Tabs from other devices, History, Bookmarks).

**Found in**
* Release v140.0.1

**Affected versions**
* Release v140.0.1
* Release v140.0

**Unaffected versions**
* Beta v141.0b2
* Nightly v142.0a1

**Tested platforms**
* Affected platforms: Windows 10, Ubuntu 22, MacOS 15
* Unaffected platforms: none

**Steps to reproduce**
1. Enable Sidebar
2. Install the following themes:
a. https://addons.mozilla.org/en-US/firefox/addon/colorful-abstract-neon/
b. https://addons.mozilla.org/en-US/firefox/addon/visionary-balanced/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search
c. https://addons.mozilla.org/en-US/firefox/addon/activist-balanced_/
3. Open the AI chatbot screen from the Sidebar.
4. Load about:addons
5. Switch from a dark theme to a light one or vice-versa

**Expected result**
* The AI Chatbot screen background color switches from dark to light or vice-versa, as intended.

**Actual result**
* The AI Chatbot screen background color does not switch from dark to light or vice-versa.
* The Tab background does not switch when focusing Tabs from other devices, History, but it will switch to the correct background color when switching to Bookmarks tab.

**Regression range**
* It does not occur in the later versions: Beta v141.0b2, Nightly v142.0a1.

**Additional notes**
* The issue only reproduces if the mentioned themes are installed.
* The issue reproduces with both Horizontal or Vertical Tabs enabled.
* The issue reproduces when switching between the main Dark and Light Themes (if the mentioned themes are installed).
* The issue seems related to bug 1971487.
* Demo: https://drive.google.com/file/d/1rrekLJgyhk23uu9XEhrs7Fo_4jp0dxXH/view?usp=sharing