I'm running into a problem where on occasion Safari starts misbehaving.
The symptoms are tabs stop having the quit icon appear on hover, and can only be closed by hitting command-w. At the same time, the quit option becomes greyed out, and I must now force quit it. When I restart after a force quit, interestingly enough, a number of blank windows are restored, along with whatever windows I'd had open.
I suspect that one of the extensions I'm using is causing this issue, but I've no idea how to narrow it down to one single extension. So far I've no idea how to consistently trigger it; It seems to just happen after a day or two's worth of normal usage.
Am I stuck doing a binary search, spending a week disabling half my extensions and waiting?