laptop freezing mozilla firefox not responding

I wasn't able to notice any web pages as being facilitators for these freezes as they seem to occur no matter what pages one happens to be on. However, in most cases, the movie keeps playing through the freeze - even though it's not visible, I can only hear it - and doesn't seem to notice that anything is wrong with the browser. If the freeze is exceptionally long, at some moment the movie will also freeze. If a web page performs playback of a Flash movie when a freeze occurs, the sound of the movie keeps going as Fx is frozen.

After all freezes Fx recovers and works as if nothing happened, until the next freeze The frequency and duration of a freeze increase the more tabs are opened and the longer Fx has been running. The freezes occur frequently, every couple minutes, and last at least a couple dozen seconds, sometimes closer to 2 mins. The OS attaches the 'Not Responding' text to the title of these windows, they stop repainting themselves and no interaction is possible with them for the remaining duration of the freeze. A couple of seconds after the CPU spike has begun, all Fx windows freeze. When looking at the process with Process Explorer it's visible that all the CPU usage occurs on a single thread from firefox.exe. Just to be clear, the CPU usage spike applies only to firefox.exe and NOT to any of plugin-container.exe child processes. firefox.exe's CPU usage surges to almost exactly 50% of my dual core CPU. When the bug manifests itself, first the CPU usage for Fx spikes. My description seems to match very well with the current bug reporter's description, but I included more details. I made a video of this bug manifesting itself and spent a couple hours looking through Bugzilla, identifying bug reports about this issue.

Laptop freezing mozilla firefox not responding