The paste operation on Firefox behaves strangely when dom.event.clipboardevents.enabled = false
(which is exposed in the UI of several extensions)
When disabled, rich text appears to have been pasted into VE, with links in blue (but the link isnt editable), but in reality the paste has failed to change the underlying data in VE.
If the user starts typing, the pasted richtext disappears.
If the user saves immediately after the paste, the richtext remains visible in the VE, but the save only adds blank lines instead.