Mozilla rolled out it’s version 157 release of Firefox on September 29, 2026, which included a major overhaul to its user interface. The new look is set by default on macOS and Windows, but Linux distributions will likely need to enable the new look as the theme of the desktop environment is preserved.
This is where to look.
- Go to the browser settings.
- Select Appearance.
- Under Browser theme, select Manage Firefox themes.
- For the theme details at the top of the page, uncheck Use Linux system theme.
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| Uncheck the Use Linux system theme to toggle the new Firefox theme. |

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