[Affected versions]: - Nightly 60.0a1 [Affected Platforms]: - All Windows - All Linux - All Mac [Prerequisites]: - Have the latest try build 60.0a1 from (2018-02-13) installed. - Accessibility tab is enabled. [Steps to reproduce]: 1. Navigate to any website, press the "F12" key and click the "Accessibility" tab 2. Click the "DOMNode:" line from the "Properties" panel. 3. Hover the "Inspector Node" button and observe what happens next. [Expected result]: - The "Inspector Node" button is visible. [Actual result]: - The "Inspector Node" button is no longer visible. [Notes]: - The color of the button when hovered is the same with the color of the selected line, so, even though the button is still there, it can't be seen. - Attached is a gif with the issue.

Will be fixed in next try push.

On the latest Firefox Nightly (Build ID: 20180426220144) the issue cannot be reproduced on Mac OS X 10.12, Windows 10 x64 and Ubuntu 16.04 x64, thus I will close the issue as VERIFIED FIXED.