Good day! Today I have opened Mozilla Firefox as usual and for some reason, everything was gone, by everything I mean EVERYTHING, no logins, no passwords saved, no bookmarks (I had probably around a thousand of them) no search history, nothing, I was trying to restore my previous session (with more than 100 tabs open... yeah I know) and nothing happened. For some reason the starting page was Yahoo instead of my normal Google search page... but I don't think it was that typical virus that replace everything with Yahoo and makes it impossible to change it back, because I was actually able to change the starting page back to google without any problems and my Malwarebytes didn't detect anything, so I am absolutely baffled as to what happened. I was trying the sync service but it doesn't work at all, nothing is restored. It's almost like someone broke into my account synced with everything and then erased it all from the server... is it even possible? Or could something overwrote or replace the Mozilla Firefox files on my computer? Where should I look for my original files, settings, saves, etc. on my computer, maybe something has been saved? Maybe I can find something? Please help, it is really painful to lose thousands of websites that I had saved and organized in many different bookmarks and folders. Kind regards, Simon