Hi, I want to share a bug occurring in Google sheet using Firefox (uptodate, virgin profile). The bug appeared few weeks ago here (https://productforums.google.com/forum/#!topic/docs/KlBdLukjw5s) and here (https://productforums.google.com/forum/#!topic/docs/A1MxM2-Bzjc). I summarize it here (https://productforums.google.com/d/msg/docs/8iZEqno94-4/-nX4UddalFQJ). Using backspace within a cell then exiting the cell add a line break in the cell. It could be considered as a pure google bug but it only happens in Firefox, in Chrome everything is normal. I know it's somewhat a story of the chicken or the egg but maybe Firefox specialists could help understanding the bug. Thanks in advance.