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

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Add-ons (extensions, themes, and plugins) that are known to cause stability or security issues with Firefox 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.


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 (Tools menu in Windows XP), 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" menu, make sure that the Update Add-ons Automatically menu is checked.
  1. At the top of the Firefox window, click on the Tools menu, and select Add-onsOn the menu bar, click on the Tools menu, and select Add-onsAt the top of the Firefox window, click on the Tools menu, and select Add-ons. The Add-ons window will open.
  2. Select the Extensions or Appearance panel depending on the kind of add-on.
  3. Then click Find Updates. If Firefox finds an update, you will be prompted to install it and restart Firefox.

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To check if any of your installed plugins are out of date, visit Mozilla's Plugin Check & Updates page.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 add-on 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 list of blocklisted add-ons.