I've used uBlock Origin on different browsers and computers for a long time, with great results. But now Firefox has disabled it claiming it can't be verified, along with literally all my other add-ons.
I can see uBlock Origin still is included in the "staff pick" list, yet can't be downloaded. Or any other add-on, basically. Please solve this.

I have been a very happy user of uBlock Origin. Firefox (v66.03) has suddenly disabled uBlock Origin claiming it can't be verified. Attempts to install the XPI from a file fail because Firefox thinks the file is corrupt. This is not a uBlock Origin problem, it's a Mozilla issue, and Mozilla needs to fix it as soon as possible.