Feature request - Visualization option mark text instead of thumbnail?

[piecevcake]

I wrote a bookmarklet to mark the text of the listing, but sadly it seems to doesn't work for videos I played from the YT queue. (I am not an expert)

javascript:(function(){ var css=document.createElement('style'); document.head.appendChild(css); css.innerHTML='a:visited {color: #FF0000%20!important;}';%20})();

I did find the coloured text easier to see than greyed out thumbnails.

(this is not something I would want but different coloured text would be a way to distinguish completely watched videos from just opened if you wanted to)