Continuing the discussion from uBlock Origin marked as "shimmed" at arewee10syet.com:
Just out of curiosity, how many of popular add-ons are considered in Bugzilla compatibility bugs or www.arewee10syet.com? Any guidelines on the number of installations? Or top N add-ons exceptionally tracked? Are there any special add-ons that requires more testing for some reason?
The page lists the top add-ons by usage (though that can be difficult to determine for non-AMO add-ons). It looks like there are ~900 add-ons on that list.
Testing add-ons with e10s on is relatively easy. Making sure they work without shims is a bit trickier, but can be done. Some add-ons are hard to obtain because they are distributed out side of AMO, maybe bundled with non-free applications. Others have so many features, and some of them may be broken.
If you can spend some time testing add-ons for e10s compat, please let us know. Thanks!