While I thank you for your input, it's not solving my issue, and as I said, all plugins and programs are up to date. I've already tried the steps in that forum. After I made that post, I checked other formats and not even .gifs are working. There is an issue with windows allowing me to select firefox at all, not just for one format. When I click open after selecting firefox as I did in the second image, nothing happen. No errors, no conformations, no option to use firefox at all.