[FIXED] Certificate issue causing add-ons to be disabled or fail to install: May 5, 2019: We released Firefox 66.0.4 for Desktop and Android, as well as Firefox 60.6.2 ESR that re-enables extensions. For more information, please read the update on https://blog.mozilla.org/addons/2019/05/04/update-…

[FIXED] Certificate issue causing add-ons to be disabled or fail to install

Topic		Replies	Views
Error - the add on downloaded from this site could not be installed because it appears to be corrupt old version Add-on Support	4	1491	July 12, 2024
Addons certificate fix for old FF versions? Add-on Support	4	1535	May 8, 2019
Thread: Add-ons not working due to certificate expiration - FireFox ESR 52.9.0 (32-bit) and older Add-on Support	45	7396	May 18, 2019
Thread: Add-ons not working due to certificate expiration Add-on Support	379	60397	December 7, 2020
Ublock stopped working addons.mozilla.org	6	7313	May 4, 2019