[enzolovesbacon]

I have the same issues/annoyances as you.

Also, for the past few weeks, I set up a few Linux desktops. When you install Firefox Quantum alongside with the pre-installed Firefox ESR (most of mainstream distros has it) and enable sync, your bookmarks will have a higher chance of being incorrectly synced and your history (if you chose to sync it) will probably be at FIREFOX_PROFILE_DIR/places.sqlite.corrupt

A simple fix is to close Firefox and

  $ cd ~/.mozilla/firefox/YOUR_PROFILE
  $ mv places.sqlite.corrupt places.sqlite

I'm still trying to find the time to prepare a proper bug report.