Firefox says "unverified"
Firefox (48.0.1; under Windows 10) has just warned me that Zotero [has] not been verified... [and] will be disabled after you restart Firefox".
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Just upgraded to FF 48.0.2, got the same message.
Zotero was then not found by Firefox's "about:addons" search.
When I tried to install from "https://www.zotero.org/download/", there was a warning: "Firefox prevented this site from asking you to install software on your computer". When I overrode that, it allowed me to install the add-on.
Firefox 48.0.1 - which I'd had pretty much since the day of its release, mid-August.
The version of Zotero I was using was also recent. I only installed it on this machine about a month ago (and the machine has been used daily, since).
I had to do this after finding zotero no longer ran and "refreshed Firefox" (essentially a re-install of Firefox).
I overrode the "Firefox prevented this site from asking you to install software on your computer" but then Firefox came back with "www.zotero.org: Firefox has prevented this site from installing an unverified add-on." It then refers me to Add-on signing page of Firefox.
Now I can disable add-on signing completely apparently in about:config but I am not keen to do that. Are there any other solutions?
https://wiki.mozilla.org/Add-ons/Extension_Signing
which says there is no way to work around add-on signing.
This applies to both extensions (zotero firefox and the firefox extension for standalone)
https://forums.zotero.org/discussion/59829/zotero-5-0-beta#latest
does work! with firefox 48.0.2.