Detect sIFR
sIFR is a JavaScript and Adobe Flash dynamic web fonts implementation.
Detection looks at script sources across 1 fingerprint rules among the site's public responses.
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Websites using sIFR
Loading website list…
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Signal classes
PluginView evaluates public page signals in these classes when identifying sIFR. Individual fingerprint rule bodies are proprietary and are not published.
- Script sources
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Example public indicators for sIFR
Illustrative indicators derived from public catalog metadata for sIFR. A live scan may match additional proprietary rules beyond these examples.
- sifr.js
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known sIFR signature (1 rules) at the time of the scan.
- Does not establish
- A sitewide install of sIFR, an active vendor contract, exclusive use, or that sIFR is still in place today.
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How to check a site for sIFR
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest sIFR signals.
- 2. PluginView reads only public responses (script sources) and scores them against the sIFR signature set (1 rules).
- 3. Review the confidence score and text explanation for sIFR on the results page.
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FAQ: detecting sIFR
- Can PluginView detect sIFR without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for sIFR — typically script sources. It does not bypass authentication or paywalls.
- What category is sIFR?
- sIFR is classified under Font scripts in the PluginView directory.
- How many fingerprint rules cover sIFR?
- This reference currently tracks 1 fingerprint rule across script sources. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses sIFR?
- Illustrative public indicators for sIFR include sifr.js. A live scan may match additional proprietary rules beyond these examples.
