[Affected versions]: - Nightly 59.0a1 (2018-01-05) try build [Affected Platforms]: - All Windows - All Mac - All Linux [Prerequisites]: - Have the latest try build 59.0a1 from (2018-01-05) installed. - Accessibility feature is checked in "Toolbox Options" on a new profile. [Steps to reproduce]: 1. Open the Nightly try build with the profile from prerequisites. 2. Navigate to "https://www.wikipedia.org/" press the "F12" key. 3. Focus the "Accessibility" tab and click the "Enable Accessibility Features" button. 4. Right click on the "Wikipedia" icon from the "Wikipedia apps are now available:" section from the bottom left part of the page. 5. Click the "Inspect Accessibility" option from context menu. 6. In "Properties" panel observe the "Inspector Node" button at the end of the "DOMNode:" element. [Expected Results]: - The "Inspect Node" button is visible even if the attribute is truncated. [Actual results]: - The "Inspector Node" button is not visible therefore cannot be clicked. [Notes]: - Attaching a screen recording with the issue.

Should be fixed with latest try https://bugzilla.mozilla.org/show_bug.cgi?id=1151468#c64