https://share.firefox.dev/3aWNkV0 (from bug 1690235) is another case where 260ms are attributed to "waiting for socket thread" but all threads are idle.
Bug 1618687 Comment 7 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
https://share.firefox.dev/3aWNkV0 (from bug 1684703) is another case where 260ms are attributed to "waiting for socket thread" but all threads are idle.
https://share.firefox.dev/3aWNkV0 (from bug 1684703) is another case where 260ms are attributed to "waiting for socket thread" but all threads are idle. Edit: In that profile it was the extension suspend that caused the delay.