Automated checkin: version bump for firefox 26.0b6 release. DONTBUILD CLOSED TREE a=release

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branch : GECKO260b6_2013111823_RELBRANCH
Added FIREFOX_26_0b6_RELEASE FIREFOX_26_0b6_BUILD1 tag(s) for changeset 8edba0607fb6. DONTBUILD CLOSED TREE a=release

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branch : GECKO260b6_2013111823_RELBRANCH