Add-ons that cause stability or security issues are put on a blocklist

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Add-ons (extensions, themes, and plugins) that violate Mozilla's add-on guidelines are put on a "blocklist".

What does the blocklist do?

Disables unsafe add-ons

Firefox will block the unsafe add-on from loading and present you with the following message:

Firefox has determined that the following add-ons are known to cause stability or security problems


Add-ons Blocklist Mac1

To prevent these add-ons from running, click Restart Firefox.

Blocks unsafe add-ons from being installed

When you try to install an unsafe add-on that is on the blocklist, Firefox will block the installation and display the message:

The add-on name has a high risk of causing stability or security problems and can't be installed.

Prevents plugins from running automatically

Firefox can prevent a plugin from running automatically (which prevents many issues). When Firefox blocks a plugin you'll see a message similar to this:

Click to play 1

You can then choose to run the plugin or update it (if an update is available). To learn more, see Why do I have to click to activate plugins?

Steps to take

If the installed add-on is disabled

Extension or theme

  1. At the top of the Firefox window, click on the Firefox button, and then click Add-onsOn the menu bar, click on the Tools menu, and then click Add-onsAt the top of the Firefox window, click on the Tools menu, and then click Add-ons. The Add-ons Manager tab will open.
  2. On the "Tools for all add-ons" Add-on Tools Icon menu, make sure that the Update Add-ons Automatically menu item is checked.

Plugin

To check if any of your installed plugins are out of date, visit Mozilla's Plugin Check & Updates page.

Note: If there are no updates available, you may need to contact the developer of the plugin that was blocked.

Installation blocked

If you were blocked from installing an add-on, check to see if there is an updated version of the add-on you were trying to install.

Note: If there is not an updated version to install, you may need to contact the developer of the add-on that was blocked.

What unsafe add-ons are on the blocklist?

See the list of blocked add-ons.



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