Firefox contenteditable backspace issue

I’ve been looking into a bug where Firefox users can’t backspace at the end of a paragraph when there is a decoration widget at the end.

I found this existing Chromium bug report which seems to be the underlying cause:

I’m wondering if it would make sense to include Firefox to the existing “addTextblockHacks” logic to make contenteditable behave more predictably? This is the code I’m talking about (I hard coded it to include Firefox and it worked in my case):

I can’t reproduce this on Do you have an example of how to trigger it?