User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0 Build ID: 20141111004002 Steps to reproduce: On Firefox Developer edition with the developer edition theme: 1. Customize toolbar 2. Drag a button to the tabbar 3. Exit customize mode Actual results: The button is placed on the desired position, but the background of the button is gray (unskinned) and not the dark theme's color. Expected results: The background of the buttons should be the same as the theme. This does not happen with other themes, they behave normally.

Brian, is this basically the same as bug 1097408 or does this need more work of its own?

(In reply to :Gijs Kruitbosch from comment #1) > Brian, is this basically the same as bug 1097408 or does this need more work > of its own? If this is happening in non-hover state it will need more work on it's own. I haven't noticed it on my build but it looks pretty clear this is a non-hover issue from the screenshot. jjdelc, what distro are you on and what (if any) system themes do you have applied?

Correct, it is on non-hover. I am using Ubuntu 13.10 and 14.04 (Using 64 bits Firefox). I am using Nodoka gtk2 engine.