fix(docs): drop browser-extension errors before ingestion

[posthog-eu]

🔗 Linked issue

No open issue tracks this; found through error tracking.

📚 Description

Problem

• The docs site owner gets an unactionable issue in the error tracking inbox that reopens for any visitor whose browser runs the extension — the site pays in noise, no user is hurt.
• A browser extension injected a content script into a docs page and its uncaught error (Invalid call to runtime.sendMessage(). Tab not found.) was captured. runtime.sendMessage is a WebExtension API a page cannot reach, so the thrower is not site code.
• capture_exceptions: true with no before_send grabs every uncaught error on the page, including ones from code the site does not own.
• Observed as a burst from one visitor in one session on Mobile Safari / iOS, with no stack frames.

Change

• Add a before_send hook that drops $exception events originating in an extension context, on two tells:

Tell	Match
Extension stack frame	frame filename starts with chrome-extension://, moz-extension://, safari-web-extension://
Extension-only API in message	exception type/value contains runtime.sendMessage, chrome.runtime, browser.runtime

• The message match is what catches this issue, since the event carries no frames.
• Site pageviews, analytics, and site-owned exceptions are untouched.

Alternative considered

• An error tracking suppression rule hides this one fingerprint faster but does nothing about the next extension error; the filter stops the whole class at the source.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

---

Created with PostHog Desktop from this inbox report.

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Project	Deployment	Actions	Updated (UTC)
evlog-docs	Ready	Preview, v0	Aug 12, 2026 10:53pm
evlog-render-lab	Ready	Preview	Aug 12, 2026 10:53pm

3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
evi	Skipped		Aug 12, 2026 10:53pm
evlog-telemetry	Skipped		Aug 12, 2026 10:53pm
just-use-evlog	Skipped		Aug 12, 2026 10:53pm

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commit: 001b76e