Thank you alot ! The Debugging Method Works 
Am I the only one without a solution so far? Still nothing works. What are they doing? Just a bad joke…
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I’m running Windows 10, turned on Studies and still have no extensions as of 05/05.
24 hours plus and still waiting for their Studies to correct the issue.
I enabled Allow Firefox to install and run studies yesterday and this problem still is not fixed for me. Nothing has been downloaded since than.
My version of firebox is 66.0.3
Confirmed fixed for me after enabling installing of studies in Firefox options about 10:15 AM US Eastern on 05-05-19 and the following are listed under active studies in (about:studies):
hotfix-update-xpi-signing-intermediate-bug-1548973
hotfix-reset-xpi-verification-timestamp-1548973
prefflip-push-performance-1491171
Not sure which or combination of the above did it, but it allowed me to reinstall all the add-ons that were broken.
- Firefox 66.0.3. I am on Win NT 10.0 x64, Update Channel: Release.
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Old Mozillian here. I have recovered all extensions now.
Just in case it may help understanding what happened, I am very curious to understand how alll my extensions were gone BUT some of them who survived the general disappearance (both on Nightly and Release versions)
screenshot for them attached
Just got done switching all my bookmarks and addons over to Chrome. Firefox had a good run but just can’t be using a browser without any spam protection.
Hope you guys get a fix sometime soon. I have a feeling it’s more than that though. F*-ups this bad don’t usually make it past testing…
some users… pls fix that annoying bug! its horrible to surf without spam protection / adblocker.
I have two up-to-date mobile browsers (Android and Beta) plus a desktop one sporting v. 49 (can’t use ESR due to extremely high impact on CPU usage). Not sure if this latter has been involved in the issue, but I do know Beta for Android has all of them disabled, while the very same add-ons are perfectly working on the Android release except ADB.
Thank God I never installed more sensitive ones, and besides that both mobile browsers operate as usual (I guess also desktop one can- too bad can’t check it right now).
Just waiting for a viable solution even for those who are using older versions (we might be few, but I think we deserve good service as well!)
I bet an ‘algorithm’ is what caused this.
Was working on a friends computer via Teamviewer last nite on a win7 to win10 upgrade and realized she was still using Waterfox (which I installed on her computer ages ago)…Could not believe how smooth it ran on an old AMD sempron chip w/4 gb ram and loved the layout of the search bar and the ability to run Flashblock & Classic Theme and a few other older add-ons which still worked when it was truly open source…tried installing FF and couldn’t get even Ublock Origin installed and the ads and vids and junk was popping up on the screen like I haven’t seen in I don’t know when…Caused me much grief till I searched my way to the point where I realized it was a Netwide problem…I left Waterfox as her default browser and she is happy with it…I intend to download it again myself and search out my old add-ons and take it for a spin on my I7…Made me ache for the “old days” I gotta admit
Still haven’t gotten the update I have now switched back to Chrome again who I left a long time ago
Thank you Mozilla! At long last!
Company policy mandated the use of Firefox with no other browser allowed and we just got instructions to ensure that all branches countrywide are switched to another browser as of right now so that at start of business tomorrow there is a seamless changeover. Dam! No playing games for the IT branch tonight.
+++BREAKING NEWS+++
66.0.4 appeared on https://archive.mozilla.org/pub/firefox/releases/66.0.4/
Edit:
ESR 60.6.2 appeared on https://archive.mozilla.org/pub/firefox/releases/60.6.2esr/
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I don’t know how but now i have all my add-ons are working again ^^
Is this what I am waiting for:
“hotfix-reset-xpi-verification-timestamp-1548973•Active
This study sets app.update.lastUpdateTime.xpi-signature-verification to `1556945257”
If so, it has not cleared the add-ons for me. I have tried re-launching FF; any other ceremony to process the STUDY?
Should I try to restore known good .xpi files from back up?
This is caused by dead certificates (CA)
Is this why I am getting the message about downloaded add-on files being corrupt? Is this Study supposed to fix the problem. The Study shows complete, but my add-ons are still not there and I cannot add restore them.
Still not working. All add-ons are marked as Legacy / Not Verified.
Mac FF 66.0.3
Firefox Preferences > Privacy & Security > Install and run studies = Yes
hotfix-reset-xpi-verification-timestamp-1548973 = Complete