BashfulBob:
Does anyone know what the alleged problem with Firefox is (and does it only affect Windows users)?
Generally speaking, there's a lot of nonsense spouted on the web about this browser and that browser and personally I don't believe that Chrome or Edge are superior to Firefox. The claim is somewhat meaningless either way as both Chrome and Firefox release updates multiple times a year so the whole thing is a moving target. For every site that claims x is more secure than y there'll be a counterclaim somewhere, e.g:
http://for.tn/1ZkHBtsApart from my own personal experience with browsers in terms of usage I also ask myself the question - who am I more likely to trust: Microsoft, Google or Mozilla.
Also, these days there are any number of browser addons to enhance security and in addition to Firefox I have Adblock Plus, Privacy Badger and Ghostery installed.