@interfect If malicious software has access to your files to change things in your profile's directory, you have larger problems than it potentially adding a malicious extension in FF. At the time extension signing was introduced, the issue was Mozilla wanting to prevent extensions from being installed from the internet which had not gone through the review process for listing on Mozilla Add-ons. In addition, they wanted the ability to blacklist malicious add-ons which they found in the wild. The threat model wasn't to prevent malicious code already running on the user's machine outside FF.–May 6 at 21:18. The intermediate code signing certificate expired. This means that all add-ons signed with the cert are no longer trusted.

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In this case the browser is doing it's job.Mozilla will need to get the add-ons resigned and/or push a new cert out. Work is in progress to fix it. Fashion mod sims 4. There is no resolution at this time unless you are on a developer code branch which you can go into about:config and set xpinstall.signatures.required to false.This will not work for most users and if you don't set it back may put you at some security risks. Best option is to wait this out. I imagine they will have this fixed in a few hours. I found another way to get the hotfix. It's the same fix as above, but tinkering with settings trying to get Studies to download failed to get it on my machine.

I that described yet another way to install the hotfix. The full Mozilla Studies feed (called Normandy) is at.

Thank you Firefox team. I enabled studies, restarted, add-ons still not working. Clicked on find an add-on that works in “about:addons”, and as soon as the add-on page loaded, all of my add-ons came back on. I had only used Firefox to search for a solution since they shut down last night, but now I can use it for everything again.

The hotfix is called Hotfix: Update XPI signing intermediate Bug 1548973. The URL it gives is actually a plugin. If you click on this link (this is the same one as the feed), you'll be asked to install the plugin.

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Ignore the warnings and installUpon doing so my plugins immediately began working again. I don't know if you have to have studies enabled first or not (I had mine enabled). I also don't show it in extensions or the studies window, so just be aware you may not be able to disable it (possibly until Studies updates on its own).Update: My browser finally pulled the studies feed and the hotfix shows in about:studies (put it in your URL bar to see all studies), where you can indeed remove it. So all this does is get the fix into Firefox faster, but be sure to enable studies.