Enter key on Facebook is weird on macOS version Firefox.
I am using Firefox ESR 52.3.0 (64-bit) on my imac 27" (2017) with macOS Sierra 10.12.6. When I using this Firefox surfing on Facebook, I input word in comment textbox and press enter to comment it, the text in the textbox do not be send, but add a line on it. When I press enter key many times, the textbox will gone. When I use messenger to chat on FB on Firefox also happend this problem, and the whole messenger box will gone. I want to refresh the FB page to let the messenger box back. I do not have this problem on Google Chrome. FB do not have any problem about use enter to send text on Google Chrome on this device.
This problem also happen on Firefox 55.0.3 I just tested.
How should I fix this problem?