Created attachment 8898778 [details] Screen Shot 2017-08-18 at 9.34.44 AM.png User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20170818100226 Steps to reproduce: Created a JSFiddle to reproduce and tried a fresh profile. Currently on Mac OS Sierra 10.12.6 with 4k Retina display running an up to date Firefox nightly. Cannot reproduce on Windows 10 machine. Actual results: All options are visible for a split second when clicking into the select box but then focus is lost and clicking a second time results in missing options. Please see the JSFiddle at https://jsfiddle.net/tgpepz8x/ Expected results: Should be able to see all available options in the select dropdown.
This seems to have been fixed in the latest release