We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Adblock Plus has disappeared

more options

After several weeks of getting messages that Adblock Plus is resetting, the app has disappeared entirely. When I go to reload it from https://addons.mozilla.org/en-US/firefox/addon/adblock-for-firefox/, I get the message that download has failed and am told to check my connections. I get the same message when I try to download any of the other recommended ad blockers like Ublock. I haven't added any new security software. This is Firefox 66.0.3 (64 bit) with a Windows 7 operating system.

After several weeks of getting messages that Adblock Plus is resetting, the app has disappeared entirely. When I go to reload it from https://addons.mozilla.org/en-US/firefox/addon/adblock-for-firefox/, I get the message that download has failed and am told to check my connections. I get the same message when I try to download any of the other recommended ad blockers like Ublock. I haven't added any new security software. This is Firefox 66.0.3 (64 bit) with a Windows 7 operating system.

All Replies (1)

more options

Sorry, it's not your connection; it's everyone's connection.

A critical Add-on-related certificate expired (which obviously should not happen). As a result, all verifications for that certificate are failing, preventing many extensions from being used, updated, or installed.

The Add-ons team is working on a fix for this. Official updates are expected to be posted here:

https://discourse.mozilla.org/t/certificate-issue-causing-add-ons-to-be-disabled-or-fail-to-install/39047

Currently, the only workaround for the regular release of Firefox is to set your system clock back (for example, if your date is May 3, set to May 2; if your date is May 4, set to May 3). You might have to reinstall extensions after that, or maybe Firefox will detect the difference at your next shut down/restart. Changing the date may have other consequences, so I understand this option isn't ideal.