According to this Reddit post, the following filter prevents thumbnail images from covering the screen during the final 20 seconds of a YouTube video.

  1. Click the AdBlock button and select Options, then click the CUSTOMIZE tab.
  2. Click Edit to open the custom filters box.
  3. Paste the filters below exactly as given.
  4. Click Save.
  5. Reload the page you're trying to view.

Copy this filter:

If that doesn't work, try these:


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