[Affected versions]: - 59.0a1 (2018-01-10) - 58.0b15 build1 (20180108140638) - 57.0.4 build1 (20180103231032) [Affected platforms]: - macOS 10.13.2 - macOS 10.12.6 [Steps to reproduce]: 1. Launch Firefox 2. Instal the Awesome Screenshot Plus webextension (https://addons.mozilla.org/en-US/firefox/addon/screenshot-capture-annotate/?src=cb-dl-users) 3. Navigate to a random webpage (e.g. https://www.amazon.com/) 4. Click on the webextension icon from toolbar 5. Perform a random capture and then click the "Done" button - inspect the Local Save buttons from the right side of the page [Expected result]: - The buttons are properly aligned and fully functional [Actual result]: - The buttons are overlapping the below informative section (see the screenshot https://goo.gl/Fh5eqH) [Regression range]: - This issue is not a regression as it is reproducible all the way back to Fx 48.0 (20160726073904) (the add-on requires at least Fx48)

The author has been notified.