[Affected versions]: - 64.0a1 (2018-10-11), 63.0b13, 62.0.3, 60.2.2esr; [Affected platforms]: - Win 10x64, macOS 10.13, Ubuntu 16.04 [Steps to reproduce]: 1. Launch Firefox; 2. Open the DevTools; 3. Click on the RDM button; 4. Click on the Responsive button; 5. Click on the Edit list option; 6. Click on the Add device button; [UX Enhancement suggestions]: 1. the Save and Done buttons are to close one to another; 2. the input fields could have borders added, to make it more intuitive; 3. the Custom header can not be displayed at all until there are custom device setups added; 4. the Done button size can be increased; 5. padding under the Done button can be added so that the text is centered; 6. close(x) button for the modal can be shifted a few pixels to the left so that there it has the same distance from top as right; [Additional notes]: - image was made with dark theme, suggestions carry over to any theme;

Thanks for the UX suggestions. We have a redesign planned already in bug 1487857, and I think it addresses all of your mentioned issues. I'm closing this bug, but feel free to reopen it if you disagree or add your comments to 1487857.

Thank you for the info, will follow that thread. At first glimpse it does seem to cover my input as well.