Back on March 17th, just before retiring, I received an apparent Firefox notification suggesting I upgrade to 43.0. Since updates have typically been fast, I agreed and it apparently aborted. Since it was late, I went to bed, figuring to finish in the morning. In the morning, I downloaded the latest version of the browser from the Firefox download page (42. something, not 43.) and when I updated, it indicated it could not find my profile BUT there was a new folder on my desktop entitled "Old Firefox Data". After repeating the process a couple of times, I remembered I had ported my bookmarks to Opera several days earlier, so, desperate to get some work done, I switched to using Opera. Several weeks later, I got a Firefox notification that 43.0 was available, so I downloaded and installed it without incident. However, none of my previous profile was accessible and, in the meantime, I had added bookmarks in Opera. I was chagrined that Opera would let me export my bookmarks back to Firefox. So I wondered if someone had written an app to do that. If not, someone should!