Built-in themes in Firefox - alternative to complete themes
Complete themes have been replaced by new, built-in themes with lighter and darker color schemes. Starting with Firefox version 57, complete themes will be replaced by new, built-in themes with lighter and darker color schemes.
Built-in themes can be enabled by following these steps:
- Open the Add-ons Manager by clicking the menu button , followed by .
- Click the panel.
- Select the theme you want and enable it.
Additionally, thousands of lightweight themes are available on addons.mozilla.org. They have very limited capabilities at present, but we plan to make them more powerful in the future.