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Bug 1689309 Comment 6 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
> Is there testcase showing this behavior somewhere online?
I don't know, if you have one ;-)
You need a server, where you can upload files and change their HTML-content.
If You only create a local HTML-file and open it in Firefox, the soucecode view does NOT show the wrong behaviour and always reflects the latest changes.