I am trying to download some apps from, download.com, but a message saying 'to protect your computer, firefox prevented this site from installing software on your computer'. When I click on the 'edit options...' tab nothing happens!!!
I saw a post for a similar problem that says to check that something is checked as true in the 'about:cofig menu'. I did this and it hasnt made any difference
Hmmm, weird. I went to about:config in the browser window, searched 'xpi' and clicked 'xpinstall' a couple of times, eventually setting the value as true. It worked on the third go.