Rated 3 out of 5 stars
I add to my review:
As of today, a strange combination of this addon, plus some themes ( like Stratini ) on Firefox 4.0rc2 totally freeze firefox and crash!
Rated 5 out of 5 stars
Very useful for debugging things, or just access things made by stupid developers who think only their browser exist on the planet, and deny everything else, or redirect you.
One point, the user agent updated list MUST have to be integrated ! (or at least figure as a link into the addon), annoying to search it over and over everytime:
Now repaired for ff 4.0 :)