User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release) Build ID: 20140611075517 Steps to reproduce: 1. Click here in the bug tracker on the "Browse" button to attach a file 2. Assuming you are using GTK, the GTK file chooser will open. 3. In the location field paste an URL to a picture from the web Actual results: On Windows the photo gets uploaded and attached from the remote URL Expected results: There is already support for this feature by the GTK file chooser. It just needs to be enabled in Mozilla Firefox. This has been supported by the file chooser for quite a while: https://developer.gnome.org/gtk3/stable/GtkFileChooser.html#gtk-file-chooser-set-local-only But it is up to the individual applications to make use of it, either by implementing support for the URI scheme itself or by using gio/gvfs. You can try it for example with gedit: click on "open" press ctrl+l enter "http://www.reddit.com/r/linux/comments/26ilpv/would_you_like_to_see_support_for_remote_file" (no quotes, no trailing slash) That should give you the html code of this reddit thread.