Ultimate Theme creator

Ultimate Theme creator

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.

What is Ultimate Theme creator?
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.
Users: 252 ▼ -1
Rating: 4.00 (16)
Version: 0.2.2 (Last updated: 2020-01-13)
Creation date: 2018-04-01
Weekly download count: 8
Firefox on Android: No
Risk impact: Moderate risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • tabs
  • theme
Size: 884.84K
URLs: Website
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
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Create your own theme page Functionalities

  • Choose your favorite colors to create the most awesome theme possible.
  • Give a name to your theme Drawbacks
  • Themes are not stored. If the page is refreshed or closed, all information will be lost
  • You can store and share your theme data by storing the contents of the grey box.(JSON)

Apply a theme Functionalities

  • Restore a theme by pasting the contents of the grey box(JSON) here.
  • This will help you to apply themes shared to you.


  • No storage of any data. It is not possible to recover lost applied themes unless the JSON is present with you.
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User reviews
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Risk impact

Ultimate Theme creator may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.

Risk likelihood

Ultimate Theme creator has earned a fairly good reputation and likely can be trusted.

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