Forum der Gemeinschaft Firefox

It's happened about three times now where, upon a restart of my computer, Firefox completely signs me out of my account. And when I sign back in, I'm also signed out of any other websites I was signed into before, all my add-ons are still there but are acting like they've just been installed for the first time, everything saved to my Firefox color is gone, and any changes I've made to my settings have been reset to the default. How can I stop this from happening, or at the very least, why does this happen in the first place?

This morning all my bookmarks have vanished, and I can't recover them using the instructions in the help articles. ALL WERE AVAILABLE LAST NIGHT. My home page is the only thing still there