Hello, Thanks for letting us know about your problem. Did you try by creating a new profile? For more instruction on creating a profile, please see this article Profile Manager - Create, remove or switch Firefox profiles

For more instruction to get ride of hanging, please see this article Firefox hangs or is not responding - How to fix.

Hope this solves your problem. Please let us know if this problem can not be solved by above methods. Regards

Actually, I had tried creating a new profile, and it didn't solve the issue. But I found the problem, my computer had (for unknown reasons) deleted the troubleshooting add-on, once it was re-installed, it works fine. I haven't encountered further issues with hangs on websites yet, if I do, I'll be back.

Note that this can be caused by a problem with prefs or with hardware acceleration in Firefox. You need to close and restart Firefox after toggling the hardware acceleration setting and may have to hold down the Shift key while starting Firefox.

It is possible that a reset carries over the problem, so a completely new profile might be worth a try if it happens again.