The fact that these are all RROR_MOD_NOT_FOUND makes me wonder about https://bugzilla.mozilla.org/show_bug.cgi?id=1546154.
Bug 1743427 Comment 1 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
The fact that these are all RROR_MOD_NOT_FOUND makes me wonder about https://bugzilla.mozilla.org/show_bug.cgi?id=1546154 which landed in Fx94.