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Blocklisting (or blocking) is done as a last resort to protect Firefox users from unsafe add-ons. Learn what to do if an add-on is blocked.

{for fx57}[[Template:addonsnote57]]{/for} Blocklisting (or blocking) is an action of last resort taken to protect Firefox users against [[Find and install add-ons to add features to Firefox|add-ons]] (extensions, themes and plugins) that violate [https://developer.mozilla.org/docs/Mozilla/Add-ons/Add-on_guidelines Mozilla's add-on guidelines]. __TOC__ = What does the blocklist do? = Once a block is implemented, Firefox will block the unsafe add-on from loading. Blocks can be issued at varying levels depending on the severity of issues found. * ''Soft blocks'' disable an extension by default, but allow you to override and continue to use the add-on. Soft blocks are issued for non-malicious add-ons. * ''Hard blocks'' disable an add-on and do not allow you to enable it or override the block. Hard blocks are used when add-ons are found to be malicious. * ''Click-to-activate blocks'' disable a plugin by default, but allow you to enable the plugin for particular sites. This type of block is issued for non-malicious plugins. == How will I know if an add-on is blocked? == You will see a notification from Firefox with the following message: {note}Firefox has determined that the following add-ons are known to cause stability or security problems{/note} {for mac}<br>[[Image:Add-ons Blocklist Mac1]]<br><br>{/for} To prevent these add-ons from running, click {button Restart Firefox}. If the add-on has been hard blocked, you will not be able to override the block. == Can I install an add-on after it has been blocked? == Once an add-on has been blocklisted, it will not appear in the gallery of [https://addons.mozilla.org addons.mozilla.org] until the developer uploads a new version that addresses all issues that resulted in the block request. Additionally, Firefox will prevent you from installing an unsafe add-on that is on the blocklist by displaying this message: {note}The add-on ''name'' could not be installed because it has a high risk of causing stability or security problems.{/note} 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. Please be aware that some blocks may be permanent and you may need to find an alternative add-on. == Prevents plugins from running automatically == Firefox can prevent a [[Use plugins to play audio, video, games and more|plugin]] from running automatically (which prevents many issues). When Firefox blocks a plugin you'll see a message similar to this: ;[[Image:Click to play 1 new]] 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?]] [[T:PluginSupportEOL]] = What to do if you see a blocklist notification = == If the installed add-on is disabled == Accept the notification and restart Firefox. If you choose to override a soft block, you do so at your own risk. == Plugins == Check to see if there's an updated version of your plugin. If there are no plugin updates available, you may need to contact the developer of the plugin that was blocked. = Can blocks be lifted? = Depending on the severity of the violation, the history of the developer, and other relevant factors, some blocks may be lifted once the developer uploads a new approved version. If that happens, users who had previously downloaded the add-on will immediately be able to use it again once its listing goes live again on [https://addons.mozilla.org addons.mozilla.org]. {note}To make sure you are always using the most up-to-date version of an add-on (extension or theme): # [[T:Open Add-ons|type=Extensions]] # Click on the settings icon [[Image:Add-on Tools Icon]] and make sure that the {menu Update Add-ons Automatically} menu item is checked.{/note} = What unsafe add-ons are on the blocklist? = See the '''[https://blocked.cdn.mozilla.net/ list of blocked add-ons]'''.