I'm not sure what's going on and cannot isolate a specific setting causing this. I'm using 2 extensions that seem relevant (Tab Mix Plus and TabGroups Manager), no other extensions I'm using seem to have functions that would affect tab restart/reload behaviour - list at end. When I restart Firefox, tabs reappear correctly but tab contents aren't being reloaded. They only reload when I actually click on them. I can't think of, or find, an applicable option either in options, add-on options, or about:config, that might explain this. Help requested! Other add-ons in use: compatibility reporter, customisable shortcuts, firegestures, multiple tab handler, nightly test tools, restartless restart, vertical tabs