i use firefox 79 win 10 enterprise 64bit asus a455 laptop, recently updating from 72/73 (not sure,cant remember) my problem is, my laptop go to sleep while streaming on youtube or streaming football on any site i got this problem from since previous version FF 72/73 (cant remember for sure) i decide to update to 79 till now, and get same problems. disable add-on not help, but other browsers like opera/chrome doesnt have same issue