Unreal 4.18 low fps with firefox

Hi, im having issues with unreal (using 4.18) ever since i upgraded firefox to the Quantum.
Basically, the editor gets low fps count and starts “lagging” when i use Firefox with a couple of tabs open and and unreal at the same time. It doesnt happen all the time in the editor, it goes on and off, and it fixes when i close firefox.

I have been talking with some colleagues and those that use firefox Quantum have had the same issues. Those that used Chrome have not.