Just got a Nexus 10, kinda figuring things out so hoping a simple solution.
Grabbed Firefox because Chrome had no addons and was getting too many ads and junk on the screen. Got a few addons for Firefox including one to always request the desktop version of sites.
Problem I have is that for some pages, they seem to be zoomed in by about 10% by default, the right side seems to extend an inch (viewed landscape). Put my fingers on the screen and pinch in and its fine. Is there a setting or add on to force fit a website to the width at loading?
I have one to enable zoom on pages even if disabled, but problem existed before I added any plugins.
Odd, I have firefox on my nexus 7 with no addons and I don't have this problem. Of course I'm seeing all the mobile sites, but you said you had this problem before any addons. Check your firefox settings if you haven't done so already.
ya, the problem existed right from the start for viewing desktop versions of sites. mobile sites work fine but, I want the full site being a 10" screen, doesn't make sense to view a site mobile version set for half the size.