Firefox 42 will not allow unsigned extensions (wiki.mozilla.org)
recommended by 1 user | 2015 | 288 points by fernandotakai | browsers | original thread |
One user recommended this thread. What they said:
userbinator May 4, 2019 | on: Update Regarding Add-Ons in Firefox | context

It's worth reading the comments on the original HN article about Firefox extension signing becoming mandatory. Some of them are eerily prescient:

https://news.ycombinator.com/item?id=10038999