This is a good, well intentioned extension, but it is constantly slowing Youtube down to the point where Firefox is alerting me that it is doing so and recommends stopping it - the difference in speed is very noticable when it is disabled - which is a shame as it does filter out all the nonsense that YT insist on putting in with your search results. Will disable it for now.

I experience link jumping on the page whenever the thumbnails for the videos get updated further down the page. As I scroll down and the boxes that show the links appear and then fill up the page jumps three or more lines of thumbnails back up the page. This is irritating and needs to be fixed.