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Preview of YouTube Thumbnail Quality Enforcer

YouTube Thumbnail Quality Enforcer by rainbowrad

Forces higher-quality YouTube thumbnails on youtube.com and automatically removes unwanted thumbnail URL parameters.

Available on Firefox for Android™
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About this extension
YouTube Thumbnail Quality Enforcer improves video thumbnail clarity on youtube.com by automatically forcing higher-quality thumbnail versions.

The extension includes a simple on/off toggle and lets the user choose between three thumbnail quality levels:
- Maximum (maxresdefault)
- Standard (sddefault)
- Medium (hqdefault)

Thumbnail requests to i.ytimg.com are cleaned and rewritten to the selected quality level. In addition, the extension monitors the page in real time so that thumbnails loaded later by YouTube's single-page application are also corrected automatically.

All settings are stored locally in the browser. The extension does not require an account and does not collect or transmit personal data.
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Permissions and data

Required permissions:

  • Input data to the clipboard
  • Block content on any page
  • Download files and read and modify the browser’s download history
  • Access browser tabs
  • Access your data for sites in the youtube.com domain

Optional permissions:

  • Access your data for sites in the youtube.com domain
  • Access your data for i.ytimg.com

Data collection:

  • The developer says this extension doesn't require data collection.
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More information
Version
1.2.2
Size
13.92 MB
Last updated
11 days ago (Jul 1, 2026)
Version History
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