Bug 1061736: add DuckDuckGo as a search engine option in Firefox, r=dolske

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extra : rebase_source : db3ec5190cf7c876705e56e7e1d1d6ec4e38bf29
Bug 1091980: enable firstrun page for Aurora (Dev Edition), r=jwalker, a=jgriffiths

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extra : rebase_source : 6f79bc8eaa3380d4e36722084a78ef6054ad6a74