Lighthouse Chrome plugin emulates desktop in mobile tests

[SerialTickler]

This started on Dec, 20. Even though I select "mobile" in devices, it says "Emulated Desktop" in the report. The user agent is:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/85.0.4183.140 Safari/537.36

If I test the same page in Dev tools it the Lighthouse works as intended and emulates Moto G4 with the following UA:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

[connorjclark]

You're running from the Chrome Extension, right?

I see PSI is currently on 85 (heh, I'll see about us updating that). Can you provide a URL where you see this issue?

[connorjclark]

Nevermind, I easily reproduced this with the extension and example.com. Thanks for alerting us!

[connorjclark]

example.com run

The config is right:

I suppose this is an artifact of the new v7 renderer not being able to map the old emulatedFormFactor (it is now formFactor) to the correct UI string.

lighthouse/lighthouse-core/report/html/renderer/util.js

Line 428 in 2bdf6cb

const deviceEmulation = settings.formFactor === 'mobile'

We should add some back-compat here.

@SerialTickler This means that the bug is simply the report showing the wrong text here. The test is still being run as a mobile report.