After downloading and installing Firefox 18.0 it does no longer work with Mac OS X 10.7.5 as no websites are loaded or shown inside the browser.
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i don't know if this is applying to your situation but there are some bugs when you're establishing a connection through proxys, which should be addressed in firefox 18.0.1 ...
That could apply to my situation since I have to use proxys. I will try out 18.0.1 when it is released. Thank you for your help.