sending the Do Not Track signal may impact your privacy.
They already send your graphics card name, driver version, installed fonts, screen resolution, browser window resolution, its absolute position on screen, your local network ip, local time, languages installed, orientation sensor, and a million other things.
But somehow a simple flag like DNT is a priority for Mozilla?
Liars
I had the same problem recently. Especially the youtube UI became very unresponsive and would take several seconds to respond. I have 96G ram...
I downloaded ESR instead. So far so good.