YouTube Grid Simple by GGyo245

A simple Firefox extension that lets you set YouTube grid columns (2–8) on Home and main feed pages, hide Shorts shelves, and hide in-feed sponsored/ad tiles.

Release notes (0.1.11)

• Fixed a bug where the Subscriptions page shelf hiding could miss English Relevance/Latest sections
• Restore the documented five-language support for Subscriptions page shelf hiding (Korean, English, Japanese, German, Russian)

Release notes (0.1.10)

• Hide the Shorts, Relevance, and Latest shelves on the Subscriptions page
• Improve SPA handling for Subscriptions page shelf hiding

Release notes (0.1.9)

• Fixed a bug where Home navigation could reset the stored column setting back to the default 4-column layout

Release notes (0.1.8)

• Apply the grid layout across YouTube feed-style pages, including Home variants such as /?bp=...
• Exclude non-feed pages and the You page (/feed/you) from grid styling

Release notes (0.1.7)

• Hide Russian breaking news shelves (for example, "Срочные новости").

Release notes (0.1.6)

• Hide German breaking news shelves (for example, "Eilmeldungen").
• Hide the top masthead sponsored video section on supported pages.

Release notes (0.1.5)

• Show a refresh hint when the popup cannot connect to the YouTube page

Release notes (0.1.4)

• Limit the add-on to YouTube Home and main feed pages only (reduced match patterns).
• Match the popup UI theme to YouTube dark/light mode.
• Hide in-feed sponsored/ad tiles on supported pages.
• Polish the popup UI (cleaner button, no reserved status space, clearer slider fill).

Source code:
https://github.com/GGyo245/firefox-youtube-grid-columns