owen/jsinject: jsinject

Owen Diffey dcb798982f Init - based on https://gist.github.com/danharper/8364399		3 vuotta sitten
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background.js	dcb798982f Init - based on https://gist.github.com/danharper/8364399	3 vuotta sitten
inject.js	dcb798982f Init - based on https://gist.github.com/danharper/8364399	3 vuotta sitten
manifest.json	dcb798982f Init - based on https://gist.github.com/danharper/8364399	3 vuotta sitten