We need to setup an exposure event for the PDF.js Toolbar experiment to know what users encountered the feature. Docs: * [Enrollment v. Exposure ](https://experimenter.info/jetstream/jetstream/#enrollment-vs-exposure) * [Defining Exposure Signals](https://experimenter.info/jetstream/configuration/#defining-exposure-signals) * [pdfjs_used](https://dictionary.telemetry.mozilla.org/apps/fenix/metrics/pdfjs_used)
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We need to setup an exposure event for the PDF.js Toolbar experiment to know what users encountered the feature. Docs: * [Enrollment v. Exposure ](https://experimenter.info/jetstream/jetstream/#enrollment-vs-exposure) * [Defining Exposure Signals](https://experimenter.info/jetstream/configuration/#defining-exposure-signals) * [recordExposureEvent()](https://experimenter.info/desktop-feature-api/#recordexposureevent) * [pdfjs_used](https://dictionary.telemetry.mozilla.org/apps/fenix/metrics/pdfjs_used)