Can confirm all of that. Profile with the PDF loading and scrolling up and down couple of times: https://share.firefox.dev/3Cz0vtG
Bug 1838865 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.
Can confirm all of that. Profile with the PDF loading and scrolling up and down couple of times: https://share.firefox.dev/3Cz0vtG And a profile of just switching tabs or moving mouse over toolbar icons : https://share.firefox.dev/3NyQi6M