Whenever I try to install Noia theme from mozilla's website, the browser gives me a message that software installation is disabled, even though the site's name appears in the list of sites which can install software. Please let me know what should I do. This happens with all themes and extensions in FireFox. I am using Win XP with Service Pack 2.
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I think its bcoz of "Software installation" has been disabled in firefox!
Try following:
1.) Type about:config in the locationbar of firefox and press ENTER.
2.) Now in Filter box type xpinstall.enabled.
3.) Check whether its value is set to TRUE, otherwise double-click on it and it'll automatically change it to TRUE...