Also facing the same problem from past 3-4 months. I just open the task manager. end the task thats using too much CPU and CPU usage retruns back to normal. nothing happens to my tabs in firefox. They work Normally.
Should be resolve asap
I agree! Last updates increased a LOT not the cpu but mainly the RAM!!! From the task manager with only two tabs opened I see 12 Firefox processes and more than 700MB RAM! What the heck?! BAD BAD BAD progamming here! You need better developement team! I use Firefox for years and you continue to ruin it making Firefox more and more heavy!