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Firefox Extensions: Install, Check Permissions, and Manage Add-ons

Find, install, inspect, and manage Firefox extensions on desktop or Android, including permissions and private-browsing access.
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In desktop Firefox, open the menu and choose Extensions and Themes to find, install, and manage add-ons. On Android, use the three-dot menu and Extensions. After installing an extension, review what it can access, decide whether it may run in private browsing, and learn how to disable or remove it.

Find and install extensions on desktop Firefox

  1. Open the Add-ons Manager: Open the Firefox menu and choose Extensions and Themes.
  2. Browse recommendations: In the Extensions area, look under Recommendations and select the install button for an extension you want. Recommendations may be personalized.
  3. Search the catalog: Choose Find more add-ons to open addons.mozilla.org, then search for an extension.
  4. Review the request: Read the access request shown during installation and consider whether it makes sense for the extension’s stated purpose. Confirm to install only if you understand and accept the requested access.

Extensions add or modify Firefox features; themes change the browser’s appearance. Mozilla also documents installing a signed add-on from a local file through the gear menu in the Add-ons Manager. This is an advanced installation route, not the usual way to find an extension.

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Open an extension after installation

An installed extension may be pinned to the toolbar. Select the extensions button to open its panel, where available commands can include Pin to Toolbar, Manage Extension, Remove Extension, and Report Extension. Choose Manage extensions to open the Add-ons Manager. Panel contents and commands can vary by Firefox version and extension state; pinned or disabled extensions may not appear there.

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Check and change extension permissions

Permission requests describe access to browser data or features. Read each request in context: access that is necessary for an extension’s function may still be more than you want to grant. A listing or permission screen is not proof that an extension is harmless. Install from a source you trust, and grant only access you understand.

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  1. Open the Firefox menu and choose Extensions and Themes.
  2. Select Extensions, then open the extension’s details.
  3. Review Permissions and data. Mozilla explains that optional permissions may be requested the first time an extension tries to use the associated capability; you can manage optional permissions in the details view.

For guidance on evaluating add-ons, data collection, and Mozilla’s policy-based disabling, use Mozilla’s add-ons, extensions, and themes support topic.

Choose whether an extension can run in private browsing

Desktop Firefox

Private-window access is a separate setting from ordinary extension permissions. Open the extension’s settings in the Add-ons Manager and check its private-browsing control. Eligibility and the exact controls can vary, so consult Mozilla’s private-browsing extension instructions for the current steps.

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Firefox for Android

Mozilla says installed or migrated extensions are disabled in private browsing by default. To change this, open the extension in the Android extensions manager and use its Run in private browsing control if available.

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Install and manage extensions in Firefox for Android

Not every desktop extension is compatible with Firefox for Android. You can browse at addons.mozilla.org/android or use the built-in extensions manager. Mozilla’s documented in-app flow is:

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  1. Tap the three-dot menu, then tap Extensions (called Add-ons in some versions).
  2. Choose an extension and tap the plus button.
  3. Review the requested access, then tap Add and complete the prompts.

To change an installed add-on, return to the same menu and manager, then select it. Its details can provide settings, permissions, and private-browsing access. Switch Enabled off to disable it, or choose Remove to uninstall it. Mozilla says Android add-ons update with Firefox when compatible versions are available; menu labels can vary with app versions.

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Disable, remove, or troubleshoot an extension

Disable it first

If a browser problem began after installing or changing an extension, turn that extension off in the Add-ons Manager. On desktop, you can also use the toolbar panel’s management commands where available. Check whether the problem stops with the extension disabled.

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Remove it if you no longer need it

In desktop Firefox, use the Add-ons Manager or the toolbar panel’s Remove Extension command when available. On Android, select the extension in the manager and choose Remove.

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Get help if the problem continues

If disabling the suspected extension does not resolve the issue, follow Mozilla’s extension and theme troubleshooting guidance. Mozilla may restrict or block extensions that violate its add-on policies or put user safety and privacy at risk.

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