User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0 Build ID: 20161208153507 Steps to reproduce: 1. Forward an RSS feed item. Actual results: Contents of RSS feed item is included in composing window. Expected results: Contents of RSS feed item and the URL in the Website field should be included in composing window.
This appears to be a return of this bug which was fixed several years ago: https://bugzilla.mozilla.org/show_bug.cgi?id=260844