Bug 1081343 followup: skip the tests for non-Nightly builds, and ifdef more of nsBrowserGlue.js/firefox.js

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extra : rebase_source : c2d3000538246ad6c892cd8cf7934ab55583a9d3
Bug 1031033: Expose tracking protection pref in privacy pref pane, r=adw

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extra : rebase_source : cbb2b6f1e5a4288d9718858d5c58bf166b44b778
Bug 1086958: re-add default browser strings from bug 951627

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extra : rebase_source : 082afdd90f2620c596523e4d0b16aab3a5d8296e