`f90
! delete: ytp
www.youtube.com##.ytp-play-button
www.youtube.com##.ytp-next-button
www.youtube.com##.ytp-size-button
www.youtube.com##.ytp-miniplayer-button
www.youtube.com##.ytp-fullscreen-button
www.youtube.com##.ytp-large-play-button
www.youtube.com##.notranslate.ytp-time-display

!
! delete: chat
www.youtube.com/live_chat
www.youtube.com###chat

! delete: voice-search-button
www.youtube.com###voice-search-button

! delete: comment
www.youtube.com###header-author
www.youtube.com###author-thumbnail
www.youtube.com##.size-default.style-text
www.youtube.com###simple-box > .ytd-comments-header-renderer

!
! about:config
! media.videocontrols.picture-in-picture.video-toggle.enabled false
`