I recently upgraded to the latest Mojave OS on my macbook pro. I'm now getting this file that tries to open when browsing sites via Firefox (also most current version). It looks sketch but when running malware checks, nothing is revealed. So not sure I need to delete and re-add Firefox or not. I don't want to lose all the stored data (bookmarks, log-ins, etc) if I delete. Here's a screen shot below. Thoughts? Suggestions?