It works on Chrome and Firefox.

It might depend on Firefox 24 on Linux, and there it also needs to enable the about:config "media.gstreamer.enabled" variable.

On Chrome, you need to download and drag the .js file on the extension page.

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Chrome Extension on Web Store: https://chrome.google.com/webstore/detail/repubblica-tv-html5/demjalafhenhdhpeonofnhbedhipaiml