Does anyone know how to add MIME-types to FF 1.5.1? I'd like to define how certain files, when downloaded, are handled (i.e. '.cab' files.) For example: when downloading a '.zip' file I get the option to open it or save it to disk. I also, on the first download, get the opton to: "Do this from now on" for which ever action I've selected. But with '.cab' files the options are grayed out and the default option is to "open with..."

With FF 1.0.7 I used to use the Things They Left Out (TTLO) extension to manually add/define them but it hasn't worked for v1.5+ Any ideas?