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When you install an extension on Firefox, you may see a message asking for permission to access data or features.

Note: See Extensions in Private Browsing regarding the Run in Private Windows checkbox.

Extensions may also request optional permissions to support additional functionality. The first time the extension tries to access those features, you will see a message asking for you to allow or deny those optional permissions.

In the Firefox Add-ons Manager, you can also change access to data or features to your installed extensions at any time.

View and manage optional extension permissions

Click the menu button , click Add-ons and themes and select Extensions.
Click the name of an installed extension to see more details about that extension.
Select Permissions to see all permissions requested by the extension.
If an extension has optional permissions, they will be shown under Optional permissions for added functionality. Turn each optional permission on or off with the toggle switch.