OpenLink Structured Data Sniffer by OpenLink Software Inc
Adds structured data discovery and handling of multiple content-types to your browser. Reveals Structured Metadata embedded within HTML pages in notations including POSH (Plain Old Semantic HTML), Microdata, JSON-LD, RDF-Turtle, and RDFa.
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Extension Metadata
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About this extension
This powerful browser extension adds the following functionality to your Firefox browser:
- Discovery of Structured Metadata (POSH, JSON-LD, Microdata, RDF-Turtle, and RDFa) embedded in HTML Documents
 - Handling of content-types beyond HTML -- enables your browser to natively render JSON-LD and RDF-Turtle documentsF-Turtle documents
 - A Web Service Console -- that simplifies RESTful interaction by exposing HTTP call parameters. A powerful mechanism for toggling Identity when working over TLS connections -- such that identity changes don't require browser restarts
 - A "Copy & Paste" feature for exporting content from RDF-Turtle, RDFa, JSON-LD, or POSH tabs to RDF-Turtle or JSON-LD formatted clipboards, for reuse and remixing elsewhere
 - CSV and JSON documents support with regards to data visualization.
 - One-click saving of Structured Data to SPARQL-accessible Knowledge Graphs, subject to ACLs
 - SuperLinks that connect words and phrases in current documents to entity descriptions across Knowledge Graphs, via a single-click
 
Rated 4.4 by 11 reviewers
Permissions and data
Required permissions:
- Block content on any page
 - Access your data for all web sites
 
Optional permissions:
- Access your data for all web sites
 
More information
- Add-on Links
 - Version
 - 3.4.27
 - Size
 - 2.41 MB
 - Last updated
 - 3 months ago (16 Aug 2025)
 - Related Categories
 - Licence
 - Mozilla Public Licence 2.0
 - Version History
 - Add to collection