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How to fix the failed add-ons problem from May 2019.

On late Friday, May 3rd, 2019, we became aware of an issue with Firefox that prevented existing and new add-ons from running or being installed. We are very sorry for the inconvenience caused to people who use Firefox. Fixes have been released starting with Firefox version 66.0.4. Updates will be rolled out automatically with the latest fixes. If you use [https://www.mozilla.org/firefox/organizations/ Firefox Extended Support Release (ESR)], your fix will be automatically delivered when you update to ESR version 60.0.3 or later. You can also [[Update Firefox to the latest release|manually update Firefox desktop]] or you can download and install the most recent Firefox version: *[https://www.mozilla.org/firefox/new/ Firefox desktop] *[https://play.google.com/store/apps/details?id=org.mozilla.firefox&hl Firefox for Android on Google Play] (or see your device's app download site). Please see the [https://www.mozilla.org/firefox/66.0.4/releasenotes/ Firefox 66.0.4] and [https://www.mozilla.org/firefox/66.0.5/releasenotes/ Firefox 66.0.5] release notes, and also [https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ this Mozilla Blog post] for more information. {note}'''Note:''' If you're unable to update to the latest Firefox desktop version, we've released extensions to fix issues in older versions of Firefox. See [[#w_for-older-versions-of-firefox|For older versions of Firefox]] (below).{/note} Known issues and workarounds for things that may not be restored automatically are also listed below. __TOC__ =For older versions of Firefox= The following add-ons are available if you are unable to update to the latest Firefox desktop release. * [https://addons.mozilla.org/firefox/addon/disabled-add-on-fix-52-56/ Add-on fix for Firefox versions 52-56]. This extension will fix the issue for Firefox versions 52 through 56.If you install this extension and then upgrade to a supported version of Firefox, please uninstall this extension as it may not be compatible with updated versions. <!--57-66 still waiting for fix. Hiding this section in the meantime *[<Link> Firefox versions 61-66 (pre 66.0.5)] If you did not receive the fix for Firefox version 66 via Mozilla's studies program, or if you are running Firefox version 61 - 66 and do not want to upgrade to Firefox 66.0.5, installing this extension will resolve the issue. If you install this extension and then upgrade to a supported version of Firefox, please uninstall this extension as it may not be compatible with updated versions. --> We are currently working on fixes for other versions of Firefox. If you are having problems with these add-ons, please [https://bugzilla.mozilla.org/enter_bug.cgi?product=Toolkit&component=Add-ons%20Manager file a bug here]. =Known issues and workarounds= Below are known issues and workarounds for things that may not be restored automatically. ==Add-ons appearing as ''unsupported'' or disappeared from your ''about:addons'' page.== Under certain circumstances, users updating to Firefox 66.0.4+ may see some of their add-ons disappear ([https://bugzilla.mozilla.org/show_bug.cgi?id=1549718 Bug 1549718]). The data for those add-ons is not lost, however. Re-installing the affected add-ons should restore the previous state: #Go to https://addons.mozilla.org/firefox/. #Search for your add-ons and install them individually. ==Master password== {note}This is fixed with Firefox 66.0.5. This section applies only if you have 66.0.4. [[Find what version of Firefox you are using|Find what version of Firefox you are using]].{/note} If you have a master password that has not been used for a while, the fix in 66.0.4 might not take effect. You can work around this by entering or resetting your master password. If you know your master password: #[[Template:optionspreferences]] #Select the {menu Privacy & Security} panel. #Under ''Logins and Passwords'' section, click on {button Saved logins…}. This will prompt for your master password. #After you have entered your master password successfully, restart Firefox. If you don’t know your master password: #Follow the instructions at [[Reset your Master Password if you've forgotten it]]. #Once you have reset the master password, Firefox will restart. {warning}'''Resetting your master password will remove all of your saved usernames and passwords.'''{/warning} ==Container add-ons== Containers add-ons may reset to their default state. If add-ons that use the Containers functionality, like Multi-Account Containers and Facebook Container, were disabled as part of this problem, any lost site data for containers, as well as deleted custom containers you may have configured, will not be recovered by this new release. Data that may be lost for Container add-ons include configuration data, for which containers to enable or disable, and container names and icons. Locally-stored data for the container (cookies and permissions) are also affected ([https://bugzilla.mozilla.org/show_bug.cgi?id=1549204 Bug 1549204]). See [[Multi-Account Containers]] to set them up again. ==Themes will need to be re-enabled== Settings for themes will default back and will need to be re-enabled: #Visit [https://addons.mozilla.org/firefox/themes/]. #Click on the theme you want to install. #Click the {button Install theme} button. Click {button Remove} if you change your mind. Your changes will apply automatically. See [[Use themes to change the look of Firefox]] or [[Built-in themes in Firefox - alternative to complete themes]] to learn more about themes. ==Home page and search== If your home page or search settings are set by an add-on, they will be reset to their default settings ([https://bugzilla.mozilla.org/show_bug.cgi?id=1549192 Bug 1549192]). To change them back: ===Home page=== #[[Template:optionspreferences]] #Select the {menu Home} panel. #Choose your desired settings for the ''Home page and new windows'' and ''New tabs'' by clicking the drop-down menu next to each one. ;See [[How to set the home page]] for more information. ===Search=== #[[Template:optionspreferences]] #Select the {menu Search} panel. #Choose a default search engine and additional search engines. ;See [[Change your default search settings in Firefox]] for more information.