lol so if you ever get a pernicious virus in your browser, you'll know what to do (Me too)

IObit he says is really good and you can choose free or pro

ok I asked a tech guru friend and he said use an uninstall software program to get rid of the virus (if that's the issue). It may be in the software of the Opera browser so doing it manually won't get that out. There are free ones on the web.

I would think if you had that huge a virus problem it would go thru ALL of your browsers? Slow down ALL of your functions? You could try a bit of research before you do anything else and find out the answer to my question...
Can a virus attack only one browser when you have several?

try advanced system care then cuzz it runs different diagnostics too and again free and paid programs.

try Glary utilities They have a paid or a free version so depends on your budget. It runs quite a few diagnostics and I am crazy about it and so are a couple friends who are more tech savvy than I am. Good luck.