Hmmm... I've never encountered such an issue.
Does that happen with any thread or only with a specific one?
As for me~
My adventure with Firefox ended when it started to work horribly after certain update.
Same with Opera - There was an update that made watching YT laggy and stuff.
I'm not even mentioning IE - I tried to use that once and it froze my PC. It literally did, I had to turn PC off and on. The purpose of this browser is to download another browser.
Now I'm using Chrome and everything seems to be nice. So far I can only complain on amount of processes it runs and amount of memory it takes (in total).
I have no idea why it's so messy. Hmm.. It seems that it's not the only one software, that does that. *looks at discord* ( ͡ °_ ͡° )
By the way, I like when explorer.exe stops responding and crashes. It makes a nice screensaver. ( ͡° ͜ʖ ͡°) jk