Customize firefox and add button to Textmaker Addon

Give me option to edit Subtitled of youtube videos using a firefox addon Requirements : 1- add a button in the textmarker menu that creates a div that contains the auto generated subtitles below a video that stays there after I leave the page and return. 2- add an edit button to that div that lets me correct and format those subtitles. 3- create a special note type that when I highlight a portion of text it adds the text plus a link to the video with the start and stop times for that highlighted text.