As stated in the title, for some reason firefox likes to freeze itself, other programs and sometimes whole windows by using up 100% of disk. As windows resource monitor shows, this happens when mozilla tries to write a lot of stuff to profile files simultaneously, which happens every half an hour or so. The only addon I am currently running is adblock+. The amount of tabs open doesn't seem to affect when this happens or for how long. Usually open tabs are social media, yt, wiki and google docs.