Firefox Nightly updates remove all logins + history?

I’ve been using Firefox Nightly for a while, but as of earlier this week the nightly updates remove all logins and browser history. Any idea why this happens?

maybe they are changing the format of stored data and need to do “wipes” as we call them over at star citizen.

It could be a nightly build feature so they can get better testability. But why exactly is done nobody mentions it, I could not find anything about it.

What I read about is some users can zip-backup their profile (that is stored in %AppData%) and then do whatever upgrade they like applying the zip right where it was.

Maybe, but this didn’t happen before. It also makes updating daily extremely awkward, so I can’t imagine it’s intentional…