No warning for browser upload if files not exist

[TiloBunt]

Binary package hint: firefox-3.5

E.g. use Gmail (also tried with other upload form GMX) and add an attachment -> Browse -> use "type in Filename" enter in the Location text field something which doesn't exist like "blablabla.jpg" hit enter and when you send this email you don't get any warning or so that it doesn't exist. On GMX it upload a 0.0 KB file.

Appreciate a warning if file doesn't exist. (not sure if this is nautilus or something)
Thanks

ProblemType: Bug
Architecture: i386
Date: Wed Dec 30 00:21:25 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: firefox 3.5.6+nobinonly-0ubuntu0.9.10.1
PackageArchitecture: all
ProcEnviron:
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-16.53-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-16-generic i686