We have Windows 7 Pro 64bit and Internet Explorer 11. We have noticed more and more lately that youtube and other websites are saying that our browser is no longer supported or lacks sufficient criteria to work properly on their web site and to either update or upgrade our browser. Well, we can't update or upgrade IE 11 because Microsoft said we are already running the most up-to-date browser that Windows 7 operating system will allow, and so does it make sense to install Firefox in order to then make our browser compatible or at least more compatible with the sites that now doesn't like our current IE 11 browser? ....and NO, We Will Not Install Google Chrome! This was already one of the WORST things we have ever done...even though a bunch of people said they didn't have problems with Chrome, we ended up with nothing but constant problems and so went back to IE11 !