Hi. I'm on Windows 10 pro. I tried in normal and debug (no extension) modes, same problem: Firefox doesn't respond at all if DF is running. As soon as DF is closed, Firefox reacts again. Same result when DF is launched first or Firefox first. It's quite strange as there's no CPU peak, and all the rest seems to run normally.

I'm seeing nearly the same issue, except that in my case it seems to prevent Firefox from starting at all.

Well, I don't know if it's the same as me, but if I launch Firefox while Df beta is already on, Firefox laggs so much that I only have the interface but no page content.

From what I've seen in another thread, the problem might be the combination of DF 11.2b3 + Firefox + Eset antivirus. That's what I have.

That is also the combination that I am running. Hmm.

I'm thinking the Eset combo is the problem. I don't use it and installed 11.2b3 just now and Firefox seems fine.

Any idea when the next Beta is coming out ? I am still having this issue with Firefox,ESET,and Displayfusion.
I did also report this to ESET too, but haven't heard back from them. This makes Firefox impossible to use ( it can take as long as 5 minutes for a page to fully load).

I'm sorry I wasn't more accurate with my statement. I HAVE rolled back to a stable build, and it is working as expected. I meant to say that I can't use the BETA build, because it makes using a browser impossible.
I'll try the next beta build! I am not using a mission critical setup ( my home pc is for gaming mostly), so I don't mind being a beta tester.