Comment 6 for bug 221409

I am apparently not the only one to notice this problem:
http://brainstorm.ubuntu.com/idea/7388/

And I finally was able to get to that 23hq.com page and I noticed... that it will show all files for me, whether they are pictures or not.

Additionally, I can't replicate your screenshot1 (showing the file extensions).

Until someone can show me the code being used to get that dialog box that states "images" and limits to image types, I can't be sure that it isn't an ubuntu or firefox bug.