I started to get unpredictable problems with Firefox - sometimes delays, sometimes media issues and sometimes it just stuck, for example. It was a pity because I had used it for a while and was pleased with it.
A few months ago I changed painlessly to Pale Moon and am happy again. I have lots of add-ons and things yet it takes (I've just closed and restarted it to be sure) just a couple of seconds to open the blank page and another six to fill that page with the BBC news.
Several of you worthies on here (you know who you are, thank you!) helped me when I had issues with Thunderbird. Some told me to chuck it and some suggested how to fix it. I did the latter but the shadow of the problems still hangs over me. Do any of you have experience with FossaMail? It sort of seems to be to Thunderbird what Pale Moon is to Firefox so is a bit of "the devil I know". Is it a success?