Here's a free extension for Firefox that will automatically pause YouTube videos when you leave the video page. It will then resume playback when you return to the page.
1. Go to the YouTube Smart Pause download page.
2. Click the Download Now button.
As a chronic tab opener, I can see this being very useful. I've had videos keep playing in the past when I wanted to check something else, and it's quite annoying. YouTube Smart Pause puts a stop to that.
For more, see the original article at the link below.
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