Not reproducing on `data:text/html,<textarea rows=20 cols=50>`, I was using Windows 10 64bit but I also could reproduce on Ubuntu 18.04 and MacOS 11.5.
Bug 1719410 Comment 7 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Not reproducing on `data:text/html,<textarea rows=20 cols=50>`, I was using Windows 10 64bit but I also could reproduce on Ubuntu 18.04 and MacOS 11.5 on facebook.