Cookie Knight by MyelophOne
Cookie Knight: Remove unwanted coCookie Knight is a Manifest V3 Firefox extension for removing unwanted cookies while keeping trusted sites protected. It clears cookies after the final open tab for a site domain is closed. Exact domains and wilokies
Available on Firefox for Android™Available on Firefox for Android™
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About this extension
Features
- Automatically removes cookies after the last tab for a site domain is closed.
- Fully respects Firefox containers by tracking cookies, cleanup, and whitelist rules per container.
- Whitelist supports exact domains, subdomains, and wildcard patterns.
- Modern responsive popup for quick whitelist changes and cookie inspection.
- Per-cookie and per-tab cookie removal from the popup.
- Optional toolbar quick action to add or remove the current site from the whitelist.
- Optional context menu actions, requested only when enabled.
- Toolbar badge shows active cookie count for the current tab and hides zero.
- Configurable cleanup delay after the final tab closes.
- Optional cleanup of Firefox partitioned cookies related to the affected site.
- Optional localStorage cleanup with the optional
browsingDatapermission. - Optional startup cleanup for cookies not protected by the whitelist.
- Export and import for settings and container-aware whitelist rules.
- Light and dark toolbar icon themes selectable in settings.
- Localized interface for English, Russian, German, Polish, Spanish, Italian, Portuguese, Turkish, Ukrainian, French, Japanese, Korean, Simplified Chinese, and Hindi.
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Permissions and data
Optional permissions:
- Clear recent browsing history, cookies, and related data
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.0.0
- Size
- 87.23 KB
- Last updated
- 20 days ago (Jun 2, 2026)
- Related Categories
- License
- MIT License
- Version History
- Add to collection
The developer of this extension asks that you help support its continued development by making a small contribution.