User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:62.0) Gecko/20100101 Firefox/62.0 Build ID: 20180920131237 Steps to reproduce: Open a form that has a file input using Mojave on a Macbook pro. Browser freezes, needs a restart. Actual results: Browser froze and I had to restart. Tried again, same result. Expected results: I should have been able to browse the filesystem and pick the file I wanted to upload.

This is a problem that occurs only with OSX10.14 and should be fixed in the next Firefox Release. Thank you for the bug report !