The fact that this benign comment is so downvoted says a lot about the sort of people who are brigading this thread.

I'm glad that all of the addons you use are the ones they've approved of and which haven't been made incompatible by any of the major breaking changes they've introduced in the last few years.

Those seem like two entirely unrelated issues

I don't know the whole story, but I'm inferring that the signing change affected the ability for people to sideload plugins.

That had nothing to do with the move to WebExtensions and the associated compatibility issues though...

I feel that Mozilla's misdirection is one very large issue encompassing many problems.