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There's also a safebrowsing extension for firefox to help identify phishing or spoofing.
If so, it's possible that you might have set your pre-1.5 "xpinstall.enabled" option to false, blocking software installation. This option is no longer exposed in the Firefox Options GUI, so you may need to dig a bit deeper into your Firefox configuration.
Browse to the URL "about:config" and look at your xpinstall.enabled option setting. Double-clicking the option will toggle it from false to true and back.