Although I used to use this add-on for a very long time I am disappointed to find it is now offering a "service" to ChatGPT without informing me about changed terms of services or similar.
I'm unsure whether this is even allowed under the current license. Find the new repo at https://github.com/OpenLinkSoftware/OSDS_extension

The OpenLink Structured Data Sniffer is a "hidden gem" that simplifies the exploration of structured data on webpages. It even lets you navigate linked data from any URI containing an RDF model (accepting OWL, XML, TTL, HTML RDFa microdata, JSON-LD and more). It's user-friendly and fast, working on large OWL models such as D3FEND and those from the Financial Industry Business Ontology (FIBO). Looking forward to seeing the OpenAI integration continue to be developed!

Really great extension for people who want to optimize their websites for search engines. It lets you see what data your competition has that you miss so you can fill the gaps.
Really appreciated! Keep on the good work!

I can't find the ""Copy & Paste" feature for JSON-LD"

I can never get enough structured data!

I became a fan at first use but it stopped working! Tried to update - no success (I have FF 52.04 64 bits + OSDS 2.13.9).
Really hope it'll wake up...
EDIT: now, with FF 53.0.3, OSDS 2.14.5 works perfectly again… :-)

EDIT2 (nov 2018): Now I notice that FF Quantum correctly takes into account XSL style sheet when displaying XML documents ONLY IF OSDS is NOT active. With OSDS active, the XML tree is shown without XSL style rendering (try http://gja.frndz.pagesperso-orange.fr/technik/xsl_tuto/monXML.xml - an example in my page on XML/XSL/PHP transform). Is there any setting to avoid this while keeping OSDS active?

This Firefox add-on shows semantic details present in a that generally go unseen by users.

This add-on allows me to utilize notations embedded into documents that containing structured data much like a browser or web-crawler would; without having to open another browser tab.

A must-have for anybody serious about the Web and its future.

Provides a powerful addition to Firefox that reveals the otherwise hidden benefits offered by a Semantic Web. For instance, I can see how Microdata, RDFa, JSON-LD, RDF-Turtle, and POSH amount to a variety of notations for embedding structured data in pages which make them easier to understand by modern agents (browsers, crawlers, smart agents).