In order to understand the crashes, I really need to reproduce them. Links to content where the issue consistently happens is helpful. If you're off the beaten path of major websites, sometimes poorly-written advertisements or straight-up malicious advertisements will be in rotation as part of third-party ad networks. The larger, commercial ad networks inspect the Flash content that's submitted for malicious behavior, but as you can imagine, the smaller niche platforms may not be as savvy or well-resourced. When it's a misbehaving banner, the issue will often appear transitory, as the banner will eventually fall out of rotation.
When you see the slow script dialog and continue, it's usually badly written content or malicious content. If the content is pegging the CPU (which is why we throw the dialog in the first place), Firefox will time out after waiting 30-seconds for a response from Flash, and it will kill the process. The crash signature that gets recorded by Firefox is the generic crash I was talking about, but this is basically working by design.
Sometimes what will happen, is that either Firefox or Flash will update automatically, but the version on the disk is different than the version that's still running in memory. Until Firefox is fully closed, you have this mismatch that might lead to funky behavior. We haven't shipped an automatic update in several weeks, so that's probably not the deal. With the ability to have 30 tabs open and never really needing to reboot, we see a lot of really funky crashing that isn't something you encounter until you've been running for 100 hours or something. Those are brutally difficult to reproduce and investigate in lab conditions.
Anyway, I can't do much with "it's crashing" or "it went away". If you see something that consistently causes a crash, send me a link to it. If you don't want to post the link publicly, you can always send me a private message.
Thanks!
