Yes. I can use Opera 12, IE 10 or SeaMonkey 2.15 and SM would be different from Fx 10 ESR as its code is shared with Fx 18 not Fx 10 which goes unsupported sometime in February. Next time I see an IM envelope, I'll switch to another browser before I open them and move around the site and see if there are any oddities or not. It is possible that it is something with Fx 10 as it is nearing end of life. I've been too overwhelmed with all the new stuff with Windows 8 to want to upgrade Fx as the upgrade will be a big one in some ways...such as loss of builtiin Profile Manager that I use a lot).
When governments fear people, there is liberty. When the people fear the government, there is tyranny. Thomas Jefferson