Fullscreen Youtube on Twitter is a youtube extension for chrome. also, it is youtube layout extension and fullscreen toggler extension. it's a free extension , it has 29 active users since released its first version, it earns an average rating of 0.00 from 0 rated user, last update is 2822 days ago.
If you want to make sure this extension is not malicious you can check the (very short) source code at https://github.com/BaliBalo/twitterYoutubeFullscreen and use it directly from there.
You could download the latest version crx file or older version files and install it.
English.
You could find more help information from fullscreen youtube on twitter support page.
You could send emails to publisher, or check publisher's website.
You could click to report abuse of fullscreen youtube on twitter.