This is now a fully working product available on the Chrome and Firefox store!
Chrome: https://chrome.google.com/webstore/detail/mnjggcdmjocbbbhaepdhchncahnbgone/
Firefox: https://addons.mozilla.org/addon/sponsorblock/
Changes this version:
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Added support for sponsors starting at the zero second mark
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Added support for having multiple videos open at once and switching between each tab