If you have text boxes for specifying files to upload, you click in it and it automatically opens an upload window. That great except it really sucks if you want to cut and paste in the files! You can't even tab to the text field, nor can you paste into it.
WTF? This make's Firefox useless for uploading images to my image server. I surprise this "feature" made it past the suggestion stage, it is so bloody stupid.
Now to figure if this can be change in the settings...