Firefox: It's annoying to open a YouTube link in a new tab and have it start playing right away, while you still want to browse your current page. Silent Tab is a simple fix for this common frustration.
The Firefox extension introduces a new option in the right-click context menu of any link: "Open Link in Silent Tab". Click that and the link will be opened in a new tab, but it won't load till you focus on that tab. As soon as you focus, it auto-loads. Simple and efficient.