Hiya, One of the affected extensions was LastPass, and in one of their support forum threads there is a potentially valuable piece of information.
""" My Firefox was complied with gcc, I compiled it using Clang and that fixed the problems for me. Lastpass now works again. """ The thread in question here: https://forums.lastpass.com/viewtopic.php?f=12&t=356405 and the particular post is this one: https://forums.lastpass.com/viewtopic.php?f=12&t=356405&start=10#p1187835 The Mozilla bug references a GCC bug, but admittedly one with different manifestation.
