I can reliably reproduce the issue with many tabs open.
This is mitigated by the fact that if you keep the mouse button pressed and
start moving the tab again after its position got out of sync with your cursor,
it will re-position itself to follow the cursor again.
** Changed in: webbrowser-app (Ubuntu)
Importance: Undecided => Low
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Moving a tab quickly when there are many tabs open, sometimes causes
tab to left in a incorrect position
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