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