It works on script clicking pause button. Very often it goes into loop and uses 100% CPU.

The pre-loading option so needs to go bye-bye.


6/8/18 EDIT: Eh, forget what I said. The add-on just needs to be updated.

A bit annoying that it has to reload YouTube page to prevent autoplay. It also doesn't let to continue playing from the stop when I switch to YouTube from embedded video on other site. Would be nice to implement it or I will be grateful for an extention which has this functionality.

It works, but on Youtube it makes the comments section disappear. Under the video it is all blank, no comments.

Works with some sites but not others. Problem with version 57+ Firefox?

Sometimes works, sometime not.

Completely breaks the new polymer YouTube layout with the following error message:

Cannot find root node for visibility monitor desktop_polymer.js:5855:535

Do the job on some website (not all), but breaks some others too, and sometime adblocks.

I've had a few websites break with this enabled.

Disable preloading doesn't work.
Non autostart works well on youtube, I like the option to enable/disable it at any point without having to go the plugins page

This extension causes the following prompt for MP4/H.264 videos.
"Video format or MIME type is not supported."

Test link: http://www.html5videoplayer.net/html5video/mp4-h-264-video-test/

Environment: Windows 7 (64-bit), Firefox Nightly (64-bit), OpenH264 Video Codec provided by Cisco Systems is enabled