I've filed a bug regarding this : https://bugzilla.mozilla.org/show_bug.cgi?id=806311 Feel free to add your system information on that bug or describe what you faced or any other constructive input possible there. You can also CC yourself to follow along the progress.
Btw I tried this in the latest Firefox nightly and it seems that the nightly doesn't crash although the CPU usage does go up to 50%, so it seems that this bug has been fixed and will be released in the upcoming stable releases.
Btw I tried this in the latest Firefox nightly and it seems that the nightly doesn't crash although the CPU usage does go up to 50%, so it seems that this bug has been fixed and will be released in the upcoming stable releases.