Use themes to change the look of Firefox

A theme is a type of Firefox add-on that changes the visual appearance of Firefox. This article describes how to find, install and manage themes in Firefox.

What are themes?

A theme changes the appearance of Firefox, such as the color scheme and background image of the toolbars.

fx57 theme - Mac1 fx57_theme_Mac2

Firefox comes with a Defaultdefault System theme and optional Light and DarkLight, Dark and Alpenglow themes, and offers optional Colorways themes for a limited period of time, but you can always install new themes.

Note: All themes are lightweight (background) themes. Complete themes are no longer supported. See Built-in themes in Firefox - alternative to complete themes.

Installing themes

  1. Click the menu button Fx57menuFx89menuButton, click Add-ons and ThemesFx57Addons-icon Add-ons and ThemesFx57Addons-icon Add-ons and select Recommendations or Themes.
  2. Scroll through the suggested themes or visit addons.mozilla.org to browse more themes.
  3. Click on the theme's author to see more information about it.
  4. Click the + Install Theme button.
    theme card add-ons manager
    • To install a theme from addons.mozilla.org, click on the theme and select the + Install Theme button on the resulting page.
    themes fx57 2
    Firefox will download the requested theme and may notify you that it has been installed.

Managing themes

Click the menu button Fx57menuFx89menuButton, click Add-ons and ThemesFx57Addons-icon Add-ons and ThemesFx57Addons-icon Add-ons and select Themes.

  • The theme being used will be shown at the top, under Enabled.
  • Other available themes will be listed beneath, under Disabled.
Fx93Themes-LightEnabled

Reset theme to default

  1. Click the menu button Fx57menuFx89menuButton, click Add-ons and ThemesFx57Addons-icon Add-ons and ThemesFx57Addons-icon Add-ons and select Themes.
    • If the Enabled theme is an optional or added theme, it will have a Disable option.
  2. Click Disable. The Defaultdefault System theme will be enabled.

Switch themes

  1. Click the menu button Fx57menuFx89menuButton, click Add-ons and ThemesFx57Addons-icon Add-ons and ThemesFx57Addons-icon Add-ons and select Themes.
  2. Scroll through the list of themes.
  3. Click Enable to use that theme.
    fx72 enable themes

Remove themes

Note: You cannot remove themes that come with Firefox (DefaultSystem, Light, DarkLight, Dark, Alpenglow, or Colorways themes) but you can disable them by switching themes or resetting the default theme (see above).

To remove an installed theme that you previously added to Firefox:

  1. Click the menu button Fx57menuFx89menuButton, click Add-ons and ThemesFx57Addons-icon Add-ons and ThemesFx57Addons-icon Add-ons and select Themes.
  2. Click the ellipsis (3-dot) icon that displays for the theme that you want to remove and then select Remove.
    fx72 remove themes
Note: If you remove the Enabled theme, the Defaultdefault System theme will become enabled.

If you are not able to remove a theme, see Cannot remove an add-on (extension or theme).

Troubleshooting

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