Create and share your ultimate color theme for firefox with the highest level of customization possible.
Select your preferred color for various parts of the browser UI to try instantly.
This extension is powered using the theme API for Firefox.

Ultimate Theme creator - Customize and share your Firefox color theme
Ultimate Theme creator is a Firefox add-on that allows users to create and share their own color theme for Firefox. With the highest level of customization, users can choose their preferred colors for different parts of the browser UI and see the changes instantly. Themes can be named and shared, but there is no storage capability, so saving the theme as a JSON file is advised for future reference. Users can also apply shared themes by pasting the JSON contents. The add-on also allows users to reset to the default Firefox theme.
Add-on stats
Manifest V2
By: Ramkumar K R
Rating: 4.06
(17)
Weekly download count: 3
Firefox on Android: No
Permissions:
- tabs
- theme
Size: 884.84K
URLs: Website
Full description: See detailed description
Ranking
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
User reviews
by 远离中共邪教快退出党团队, 2025-03-03
by Firefox user 17365300, 2023-09-30
Add-on safety
Risk impact
Ultimate Theme creator requires a few sensitive permissions. Exercise caution before installing.
Risk impact analysis details
- Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood
Ultimate Theme creator has earned a fairly good reputation and likely can be trusted.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
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- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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