Comment 38 for bug 15179

Please do NOT save all files which firefox downloads when you choose 'open' outside of /tmp. The reason you can choose behind 'open' and 'save to disk' is obvious: you don't want to keep stuff you 'open'. If a file is opened by a user and he changes his mind (and edits anyway), however, he should be warned about saving to /tmp. But wouldn't it be much better to do this in the GTK file chooser? Just a yellow bar 'Files in /tmp are temporary' would solve the problem. Only display the bar when the user 'starts' at /tmp, not when he manually goes there. (If he does, he should know what he's doing and the bar will annoy him.) Give the user who understands the filesystem the option to not show the bar again.

Changing GTK file chooser is much more reasonable and easier than changing every application which might save something to /tmp and let users open it. (These are at least all browser and all e-mail programs.)