I can't test this now, but I remember trying it many times in Firefox, and every time I'd get a little icon that showed a little broken image. It was only after

I can't test this now, but I remember trying it many times in Firefox, and every time I'd get a little icon that showed a little broken image. It was only after the Firefox 4 upgrade, that it started working (well in gmail's case, kind of working). Having looked into what gets sent, it is definitely a Firefox thing, but for me, it only started doing it with 4.0, so hence this post.