Shield Study: JavaScript Errors

A [Shield study][] to test collecting JavaScript errors thrown by Firefox chrome code (not errors from webpages themselves).

Overview

This study listens for browser chrome errors being logged to the Browser Console. It then computes a hash based on the error type, name, and stack trace, and sends that hash in a shield-study-addon Telemetry ping along with the user's client ID and environment information.

The purpose of the study is to measure the amount and distribution of browser chrome errors in a privacy-respectful way. The data will be used to create a prototype for collecting these errors to aid in Firefox development.

Preferences

extensions.shield-study-js-errors@shield.mozilla.org.logLevel Log level for extension logging. Defaults to Warnings an above. Set to 0 for verbose logging. extensions.shield-study-js-errors@shield.mozilla.org.testing If true, mark Telemetry pings sent by the client as test pings.

Development

To build the add-on, run the make command:

$ make

This will create a shield-study-js-errors.xpi file in the root of the repo containing the add-on.

To test this, you will either need to get the add-on signed by the Mozilla Extension key, or disable the following preferences on a copy of Firefox Nightly:

• xpinstall.signatures.required
• extensions.allow-non-mpc-extensions

License

Shield Study: JavaScript Errors is licensed under the MPLv2. See the LICENSE file for details.