DebugBear Test Agent

Page tests are run using Lighthouse 8.0 and Chrome 91, on a headful Chrome instance.

Server locations

See what server locations are available. Get in touch if you need to run tests from a fixed IP address.

Test devices

Settings like network speed and CPU speed depend on the device selected to run the test.

User agent

By default, DebugBear send this user agent string on desktop:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6)
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/91.0.4472.77 Safari/537.36 Chrome-Lighthouse DebugBear

And this one on mobile:

Mozilla/5.0 (Linux; Android 7.0; Moto G (4))
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/91.0.4472.77 Mobile Safari/537.36 Chrome-Lighthouse DebugBear

Note that the Chrome version is based on what's specified in Lighthouse, not the actual Chrome version that's used to load the page.

Differences to other tools and environments

Read this blog post to learn more about how different settings and environments can affect your scores.