Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:20.0) Gecko/20121207 Firefox/20.0 Using latest-birch I restarted the browser and the tabs from last time were restored despite the "show my home page" setting. Steps: 1. Run latest birch nightly and go to the preferences and set "when nightly starts" to "show my home page" 2. Open a few tabs in the window. 3. Open another window in PB mode using command-shift-p 4. Open a few tabs in that PB window 5. In the first window go to http://ted.mielczarek.org/mozilla/crashme.html and install the extension. Restart when prompted Expected: When the application restarts I should get an empty window. Actual: The first window with a set of tabs comes up. 1. Is this intended in the case of restarting due to add-on installations? Filing just in case.
Hmm, I don't think that this has changed with per-window private browsing. Try running the same steps in a regular Nightly outside of PB mode, and I believe you will observe the same (the session being restored.)
Marking as unconfirmed until we have more information here.
Tested in Firefox 18. This behavior has not changed.