The new version that just came out added a new feature where different channels (Release, Nightly, etc.) have different profiles, and for some people it seems t

The new version that just came out added a new feature where different channels (Release, Nightly, etc.) have different profiles, and for some people it seems to have not picked the right profile for the channel they use. You can try looking at about:profiles. Your old profile might be in there, and then I think you can switch back to it.