Bug 949589 - In-Content Preferences openDialog typo in features string (model= should be modal=). r=Unfocused

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extra : rebase_source : 02726a2a1de45b923dfa420d97ee7c21862e4cc2
Bug 926487 - Replace className comparisons with classList.contains in viewSource.js. r=Unfocused

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extra : rebase_source : 1e5a9b55e2c455b08454e8bd17afe4412f42a042