So we have a couple of bugs filed regarding the double prompt (Bug 1769409, Bug 1768763). I think this might be related to the new SYNC behavior (See Bug 1769095 Comment 14 for details) because all the bugs mention that this issue happens after 100. And from the description of the bug, to reproduce this issue, we don't have to start Firefox with a page with username/password, so I think the "second" prompt is not triggered by the password manager's autofill feature. Is it possible we run SYNC startup twice in some cases after Bug 1769095, which might trigger the double prompts.
Bug 1768856 Comment 5 Edit History
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So we have a couple of bugs filed regarding the double prompt (Bug 1769409, Bug 1768763). I think this might be related to the new SYNC behavior (See Bug 1769095 Comment 14 for details) because all the bugs mention that this issue happens after 100. And from the description of the bug, to reproduce this issue, we don't have to start Firefox with a page with username/password, so I think the "second" prompt is not triggered by the password manager's autofill feature. Is it possible we run SYNC startup twice in some cases after Bug 1769095, which might trigger the double prompts.
So we have a couple of bugs filed regarding the double prompt (Bug 1769409, Bug 1768763). I think this might be related to the new SYNC behavior (See Bug 1769095 Comment 14 for details) because all the bugs mention that this issue happens after 100. And from the description of the bug, to reproduce this issue, we don't have to start Firefox with a page with username/password, so I think the "second" prompt is not triggered by the password manager's autofill feature. Is it possible we run SYNC startup twice in some cases after Bug 1769095? which might trigger the double prompts.