It is possible to modify YouTube’s appearance using uBlock Origin.
For example, to display smaller video thumbnails and get rid of “shorts” and of avatars :
- from Firefox, go to extension management
- in the menu attached to uBlock select “preferences”
- go to the “My filters” tab
- check the “Enable my custom filters” box if necessary
- paste the following CSS configuration into the text area:
1youtube.com##ytd-rich-grid-row, #contents.ytd-rich-grid-row:style(display:contents !important;)
2youtube.com##ytd-rich-grid-renderer, html:style(--ytd-rich-grid-items-per-row: 5 !important;)
3youtube.com##ytd-rich-grid-renderer, html:style(--ytd-rich-grid-posts-per-row: 5 !important;)
4youtube.com##ytd-rich-grid-media #video-title:style(font-size: 14px !important;)
5youtube.com##ytd-rich-section-renderer:style(display:none !important;)
- press the “Apply” button