If you lost access to your add-ons this past weekend and you tried some advice to set `xpinstall.signatures.required` to `false` in `about:config`, you should
1. install the latest update, and
2. flip that setting back to `true`.
It's important to have this setting on to help protect you against malicious extensions.
(Don't @ me about whether you personally need or want Mozilla to sign the extensions you use. Consider this toot may not be for you.)