Before YouTube cracked down hard on ad blockers, YouTube Center had a native filter to skip video ads and banner ads.
YouTube Control Center – Get this Extension for Firefox (en-US) youtube center firefox
Click the "Add to Firefox" button and grant the necessary permissions (e.g., access to youtube.com data). Before YouTube cracked down hard on ad blockers,
You can find archived versions of the UserScript (for Tampermonkey/Greasemonkey), but they are broken. You will get console errors, missing buttons, and videos that fail to load. You will get console errors, missing buttons, and
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Set preferred video quality (e.g., always 1080p) and default volume levels.
There are several extensions designed specifically to fix the layout or add control panels directly into Firefox: