Comment 18 for bug 115071

Repeating my comment from the other bug since it doesn't sound like this addresses it:

-- The list of content types can't be modified, even to add something
identified only by file extension. I just ran into this when trying to get a
.ssa file. Firefox tried to open it and couldn't (not surprising). There's no
way to add "file with extension ssa" to the content type list, and I have no
idea whatsoever whether Firefox thinks it has a mime type or is just treating
it as unknown.
-- On that subject, there's no entry for "unknown content type" (at least on my
machine). Want to tell Firefox to save all files with an unknown content type?
 Forget it.
-- There's no way to tell Firefox whether to determine content type by
extension first or by Mime type sent by the server first. I recently tried to
open a PDF file whose content type Firefox seemed to think was BIN. There was
no way to tell Firefox that the .PDF in the filename takes precedence over the
bogus Mime type sent by the server.
-- There's usually no option "open in browser". I want to tell Firefox to open
text files in Firefox. Can't do that.