Break chrome history syncing with firefox

I didn’t know that migrating bookmarks from google chrome would totally sync up firefox with chrome. I use chrome as my game development browser, since I am on youtube there a lot for tutorials. I use firefox strictly for web development, but when I go to look at history it’s all chrome history, so 48 hours of history is in firefox. How to I completely remove the two. I already tried uninstalling and reinstalling it, but the sync is tied to the account, so it did nothing, but the same thing over.