I have it running, but I'm not pleased. First started it in English for knowing that it just start without problems. After that switched it to Dutch, again what a pain. Its Dutch now. First thing I noticed is that the fonts used in the menu bar and so on are a little bigger. This will cost you real estate on the screen, so first homepage did appear with a slider on the right. More real estate gone. Not happy with that. Didn't find a way to adjust the font size for menu's and so on.
Tried my stored passwords. No. It will definite not read the password file in the right way. It sees that I have a password, have to give it, but the screen after that stays empty, no sites, no names, no passwords. Visited sites with password didn't show up a pop up for giving the password. This one is not working.
Not a big deal, I have to read my list of favorites now because the small pictures on the left are gone.
Real pain to get all as it was installed on my present 24.8.1. All extensions are not loaded, you have to activate them manually. In former versions there was a check if they were okay for use in that version, I didn't see it in 38.2.1. Didn't get a complain too, so I guess its okay. All in all, I'm not pleased the way FF is moving. I'm afraid I have to go this ride every time I install a new version of FF.