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OpenTelemetry Browser Extension

This browser extension allows you to inject OpenTelemetry instrumentation in any web page. It uses the Web SDK and can export data to Zipkin or an OpenTelemetry Collector.

This animated image shows the process of activating the extension and seeing console output in the developer toolbar

Supported Environments

  • Google Chrome (with Manifest Version 3 support)
  • Chromium (with Manifest Version 2)
  • Firefox (unstable, with Manifest Version 2)

Installation

from Download

  • Go to Releases and download the latest opentelemetry-browser-extension--<mv2|mv3>.zip from Assets.
  • Unzip that file locally
  • Open a new browser window and go to chrome://extensions
  • Turn on "Developer Mode"
  • Click on "Load unpacked" and the select the folder, where the unzipped extension lives.

from Source

Run the following in your shell to download and build the extension from source:

git clone https://github.com/open-telemetry/opentelemetry-js-contrib.git
cd opentelemetry-js-contrib/packages/opentelemetry-browser-extension-autoinjection
npm install
npm run build

This will create a so-called unpacked extension into the build/ folder you now can load into your browser:

  • Open a new browser window and go to chrome://extensions
  • Turn on "Developer Mode"
  • Click on "Load unpacked" and select the build/mv3 (or build/mv2) folder, which contains the extension

If all goes well you should see the extension listed:

This image shows the extension being installed in chrome://extensions

Usage

When visiting a website, click on the extension icon, add an url filter that partially matches the current domain, e.g for https://opentelemetry.io/ you can set "opentel" as value:

This image shows an open extension popup with url filter set to "opentel"

Click on Save & Reload, check the developer toolbar to see how spans being are printed to the console and being sent to your collector:

This image shows spans being printed into the console of the developer toolbar for opentelemetry.io

Known Limitations

  1. The extension works with active tab permission, this means that every time you want to use it, you have to click the extension icon at least once for your tab.

  2. The use of the zone context manager and the used instrumentation libraries are fixed.

  3. Firefox support is unstable, sometimes it works, sometimes not. If you have experience building extensions for firefox, please reach out.

  4. The website you are targeting with this extension might have a Content Security Policy (CSP) in place and block the extension from injecting javascript or block the exporters from sending spans to a collector. To work around this limitation, you need another browser extension, that allows you to disable CSP for a website.