Firefox cannot install the updates on my Mac OSX Lion

Firefox tells me there is an update. I click install, but it just sticks at the downloading screen (for hours if I let it) and cannot download. This has been happening ever since I changed to Mac OSX Lion on the new MacBook Air.

Download from here and install it:
see also:
[ Installing Firefox on Mac]
thank you
Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

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