Addon works fine and does a great job at what it's supposed to do: disabling the videos on the news feed.

What I'd like so suggest is that you should be able to customize the news feed instead of just showing a blank page. This way you won't get confused why your videos are not shown anymore in case you forgot that you've installed the plugin.

Similar to the "Facebook News Feed Eradicator" plugin I'd recommend to insert some inspiring quotes as a placeholder.