for youtube, i enjoyed using mps-youtube - a console client for searching youtube. it could launch mplayer, mpv backends. unfortunately the quota for the youtube api has been exceeded. to use it you'll need your own key. if you do have a key, it requires python3-pafy and youtube-dl as dependencies.

Dillo can load sites for me (that don't require javascript). With some fltk hacking it could have a thumb-friendly UI: