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v3.0, 2025-07-12: Add fix for new youtube update to sidebar vids; remove carousel fallback.

Add a fallback option for users affected by YouTube's recent code changes that they are no longer providing an_webp animated thumbnail URLs on the homepage. The fall back makes a still image carousel/slideshow of some available screenshots apply to the homepage. At time of writing only some users affected and only the homepage is affected, other pages continue to work with an_webp animated thumbnails.

Update documentation to advise not Greasemonkey compatible.