Firefox hangs on some sites; have to kill from task manager.

When I go to some websites, such as Corair.com it hangs. I cannot click on anything. If I try to access specific pages via a search engine the same happens. I can close the browser but the 8+ processes don't terminate so I have to kill them from task manager. I clear all of my browser history when I close FF so I can't remember all of the sites this happens on, but it was more than just Corsair.com. I'm using 140.2.0esr, but also had the problem with 140.1.0esr. I did not have this issue on 128.12.0esr (I upgrade to 140 after that). I tried turning use hardware acceleration off/on, that didn't fix it. I am just about to try safe mode.