Automatically cycle through web pages

https://addons.mozilla.org/de/firefox/addon/tab-slideshow/

https://chrome.google.com/webstore/detail/loepeenhjndiclafjgoackjblfhonogb

https://chrome.google.com/webstore/detail/iaehgcjemgeldahhdeafbdeglfbaecll?hl=de

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