Some users of uBlock Origin can’t install the latest version and are instead served with the following message:
The addon could not be installed because it does not match the add-on Firefox expected.
This was reported many times on GitHub: https://github.com/gorhill/uBlock/issues/1373.
Also, in the Reviews section of uBlock Origin on AMO: https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/reviews/.
Are there known issues related to this error message?