User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0) Gecko/20100101 Firefox/16.0 Build ID: 20121024073032 Steps to reproduce: 1. Enable "Don't keep activities" in Settings > Developer options (ICS/JB) 2. Open Nightly 3. Tap on Awesomebar to open Awesomescreen 4. Press Back button to return to home. Actual results: Multiple about:home tabs are opened (Tab count changes to 3) Expected results: No additional about:home tabs are opened (Tab count stays at 1)

Only reproducible on Aurora and Nightly; not reproducible on Beta and Release.

Brian - Could we be restoring session somehow?

Guards the session restore code with "if (!mIsRestoringActivity)", which prevents the restore from happening if Gecko has already been initialized.

Comment on attachment 689490 [details] [diff] [review] Don't restore session if Gecko is already running [Approval Request Comment] Bug caused by (feature/regressing bug #): bug 722661 (Fx19) User impact if declined: Using "Don't keep activities" can result in duplicate tabs being created Testing completed (on m-c, etc.): m-c Risk to taking this patch (and alternatives if risky): low risk String or UUID changes made by this patch: none

Comment on attachment 689490 [details] [diff] [review] Don't restore session if Gecko is already running Low risk patch for a Fx 19 regression. Approving on Aurora.

Unable to reproduce the issue anymore on Aurora 20.0a2 2013-01-10 and Nightly 21.0a1 2013-01-10 on the Samsung Galaxy Note running Android 4.0.4. Marking the bug as verified on Firefox Mobile 20