I found today very interesting and annoying problem with Firefox. I tried to download Android Studio (1.1Gb) and after ~70Mb my browser just freezes and CPU usage raises. I force closed Firefox and restarted it, same thing. Did this more than ten times, no difference. I'm able to use my browser with no problems after I cancelled the download. I use the default download location and SSD. My Firefox version is 43.0a2 (Developer Edition).
What I tried so far:
- Safe Mode