Trustee Checker - PDF Timestamp Verification by WingArc1st Trustee
Open a PDF page to verify automatically.
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About this extension
Trustee Checker is a Firefox Add-on that automatically verifies RFC 3161 timestamps embedded in PDF files opened in your browser.
■ Key Features
* Automatically verifies embedded timestamp signatures simply by opening a PDF
* Displays verification results clearly in a status bar at the top of the page
* Also supports manual verification by selecting a local PDF file via the toolbar icon
■ Supported Signature Formats
* RFC 3161 timestamp tokens
* CAdES signatures (embedded in PDF)
■ Privacy
* All verification is performed entirely within the browser — no data is ever sent to external servers
* No browsing history or user data is collected
Provider: WingArc1st Inc.
■ Key Features
* Automatically verifies embedded timestamp signatures simply by opening a PDF
* Displays verification results clearly in a status bar at the top of the page
* Also supports manual verification by selecting a local PDF file via the toolbar icon
■ Supported Signature Formats
* RFC 3161 timestamp tokens
* CAdES signatures (embedded in PDF)
■ Privacy
* All verification is performed entirely within the browser — no data is ever sent to external servers
* No browsing history or user data is collected
Provider: WingArc1st Inc.
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Permissions and data
Required permissions:
- Access your data for all websites
Optional permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.0.1
- Size
- 189.88 KB
- Last updated
- 4 days ago (Apr 21, 2026)
- Related Categories
- License
- All Rights Reserved
- Version History
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