I don't like Firefox, and my choice is K-Meleon, but I can't answer for others.
I haven't tried disrupted tool, but I think that for a lot of bad pages it ought to do the trick.
After, if I really need to display correctly the page, I use right-click and Open with Firefox (or IE) if needed.
Under Linux, IE isn't ok, but it doesn't trouble me at all
Mozilla/5.0 (x11; U; Linux x86_64; fr-FR; rv:38.0) Gecko/20100101 Ubuntu/12.04 K-Meleon/76.0
Mail : alain [dot] aupeix [at] wanadoo [dot] fr
Ubuntu 12.04 - Gramps 3.4.9 - Harbour 3.2.0 - Hwgui 2.20-3 - K-Meleon 76.0 rc