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Add-ons 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."

Table Of Contents

What does the blocklist do?

Disables unsafe add-ons

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

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

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

Blocks unsafe add-ons from being installed

When you try to install an 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

Check to see whether there is an updated version of that add-on:

  • (Extensions): Click on the Tools menu, select Add-ons, select the Extensions panel, and then click Find Updates. If Firefox finds an update, you will be prompted to install it and restart Firefox.
  • (Themes): Click on the Tools menu, select Add-ons, select the Themes panel, and then click Find Updates. If Firefox finds an update, you will be prompted to install it and restart Firefox.
  • (Plugins): To check if any of your installed plugins are out of date, visit the Mozilla Plugin Check page.

If there are no updates available, you may need to contact the developer of the add-on that was disabled.

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.

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

What add-ons are on the blocklist?

See list of blocklisted add-ons.


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