After updating from 17.0.1 to 18.0.1 Firefox will not make any external connections in Windows XP (SP3 running all updates as of the date of this post. )
Preceeding the failure during the installation of 18.0.1 the update process the installation message box states "Checking compatibility of add-ons" and apparently hangs. After the firefox process is killed. Firefox is restarted and will not connect to any website, although internal cached links work - initial firefox start page and setup page "about:config"
Reverting to the previous 17.0.1 resolves the issue.
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philipp 4 months ago hello, please see Fix problems connecting to websites after updating Firefox