A theme is an add-on that changes the visual appearance of Firefox. When several themes are installed, you can switch to another theme as follows:
- Click the menu button and choose Add-ons.
- Switch to the Appearance tab. You should find your previously used personas in the list.
- Find the one you want to use and click the Enable button.
To uninstall the other ones, you can click the Remove button on them and they'll be uninstalled instantly.
For more information about Firefox themes, see the article Use themes to change the look of Firefox.
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