Splitting this off from bug 852267: > Steps to Reproduce: > 1. Open several tabs > 2. Exit Firefox (exit option, reboot, etc) > 3. Open Firefox; it will display the "tabs from last time" page > 4. Unload or exit Firefox > 5. Open Firefox again > > Expected: There is some way to restore the tabs > Actual: The session is lost forever > Recurrence: Always > User Impact: Receiving a phone call at the "tabs from last time" page always results in data loss I haven't looked very closely at this, but the problem probably is that with "Restore tabs" set to "Don't restore", we unconditionally promote the old session to the "tabs from last time" upon opening and throw away the old "tabs from last time".

FYI, this default setting is changing with bug 1219343.

Re-triaging per https://bugzilla.mozilla.org/show_bug.cgi?id=1473195 Needinfo :susheel if you think this bug should be re-triaged.

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