I applied the latest Firefox update on my Ubuntu MATE system (20.04 LTS) and now I'm seeing some odd behavior:
"Private" window browsing on some sites now becomes unusable. But not on all (I know that the only real benefit to private browsing is not saving history/cookies, but I use it at times to reduce the clutter). Typically, there isn't any difference in the user experience, but now I'm finding some sites I can not log in using a private window, but have not problem using the "standard" Firefox interface.
This suggests to me that Mozilla has added or tweaked some security capability in the latest Firefox, and that setting now collides with some sites. But I can't figure it out.
Odder still, is that the same release of Firefox on Mac (not tried yet under Windows) does not exhibit the same behavior.
Like I said, weird. Thoughts?