The QA team at my company performs tons of upgrade testing and, on each upgrade, the software generates new self-signed SSL certificates on our server. After each upgrade, they access the site with Firefox and need to make an exception for the self-signed cert (on the "Your connection is not secure" screen). After about 10 upgrades (and accepting the new self-signed certs), Firefox (46.0.1) begins to load the page more slowly. Each time after that becomes exponentially slower: - 11th time takes a couple of seconds to load - 12th takes 10+ seconds - 13th takes 30+ seconds, and finally; - 14th just doesn't load (or eventually does but I gave up after a few minutes) This can be fixed by deleting all of the Authorities from the self-signed certs (not the certs themselves). So, I'd go to Preferences > Advanced > Certificates (tab) > View Certificates > Authorities and then delete the authorities related to the self-signed certs; the actual certs aren't removed. This fixes the problem until the next 10th upgrade is performed. This also affects Firefox 45.0.1 - though is considerably worse than 46.0.1; it's unusable after 8 upgrades. When I say "unusable" I mean that our site doesn't load, all other websites load and work correctly. This affects Firefox on Mac OS X, CentOS 7/6.6, and Windows 7. The only plugin installed is Firebug Any thoughts as to why this is occurring? Thanks in advance for the help.