Yes Julien, this seems to be an ongoing issue. Just tried on Firefox 81.0 and Nightly 82.0a1 (2020-09-14).
Bug 1641483 Comment 2 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Yes Julien, this seems to be an ongoing issue. Just tried on Firefox 81.0 and Nightly 82.0a1 (2020-09-14) and the psihing message from Avast is shown.