Currently, we're only checking once when loading about:newtab if the parent window is in private browsing mode (as implemented in bug 722990). We need to check every time the user attempts a drag because the tab might have been moved to another window or the windows private browsing status might have changed since the page loaded.
Attachment #640048 - Flags: review?(ehsan)
Target Milestone: --- → Firefox 16
Status: ASSIGNED → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → FIXED
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