tries directly opening the attachment in 20 tabs (1st tab, 8th tab, and 16th tab), and 3 tab hits the issue, and I see that same single process is used for the tab, while others use multiple different processes. (8 processes, 2-3 tabs for each) and if the issue happens, reloading the page doesn't solve, and also, reloading the page doesn't hit if the issue doesn't happen in the tab at first. so, the both behavior persists until the tab is closed.
Bug 1697666 Comment 4 Edit History
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tries directly opening the attachment in 20 tabs, and 3 tabs (1st tab, 8th tab, and 16th tab) hit the issue, and I see that same single process is used for the tab, while others use multiple different processes. (8 processes, 2-3 tabs for each) and if the issue happens, reloading the page doesn't solve, and also, reloading the page doesn't hit if the issue doesn't happen in the tab at first. so, the both behavior persists until the tab is closed.