I am experiencing this exact same problem right now.
Pages appear to arrive, but the contents of whatever is in that window
don't change. The address bar and title bar do update though, and I
cannot get contextual menus. View source shows the correct source code
for the page I should be seeing.
L
Closing all my instances of FF and reopening it seems to have made the
problem go away.
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firefox does not render some pages some of the time
https://bugs.launchpad.net/bugs/173190
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