This is a simple time-saver addon that works exactly as intended and advertized on Firefox desktop (haven't used it on mobile). I love its simplicity—and the easy access menu for saving and printing reports.

Sadly, most of the 1-star reviews seem due to "lack of localhost support" from people that can't be bothered to read the addon description. It requires only a modicum of critical thinking skill to set up free dynamic DNS services for public "localhost" access, and even setting up free LetsEncrypt SSL certificates for secure https access to locally staged development sites is somewhat trivial.

Note to addon dev: perhaps add a bit more about this (localhost use requires x) to the product description, though skimmers are still gonna skim.

нормально работает

This extension does nothing so don't download

The addon only redirects everything to https://googlechrome.github.io/lighthouse/viewer, so it doesn't even work with localhost. I installed Lighthouse specifically to improve my website's performance WHILE developing, which isn't possible. Most useless thing I've ever installed.

Much better under Google Chrome, basically glorified link generator for the website version, does not let you test localhost development under FireFox.

doesn't work on firefox dev

Lighthouse returned error: FAILED_DOCUMENT_REQUEST. Lighthouse was unable to reliably load the page you requested. Make sure you are testing the correct URL and that the server is properly responding to all requests. (Details: net::ERR_CONNECTION_FAILED)

Es efectivo, logra analizar el sitio y ayuda a no depender tanto de PageSpeed Insight. Para quienes dicen que falla con sitios locales, es lógico ya que tiene que acceder a través de la internet y no en redes locales.

I normally don't give one star reviews (or any review for that matter), but just the fact that this extension doesn't work on localhost gave me the motivation to signup for a mozilla account to leave this review.
I saw one of the devs reply something like "We recommend you use lighthouse for chrome"... doesn't that defeat the purpose of this extension even existing? I don't want chrome, or any of the skynet spyware that's embedded in its binaries. This is why we need to support open-source; these silicon valley monopolies got to go. Gee.

Lighthouse returned error: ERRORED_DOCUMENT_REQUEST. Lighthouse was unable to reliably load the page you requested. Make sure you are testing the correct URL and that the server is properly responding to all requests. (Status code: 401)

Very nice and easy to use! But very often the test fails. I've got no idea why. When I test the site under the original google pagespeed link the test works. Also I have an improvement suggestion: Why do I have to make TWO tests for mobile and desktop? If I go to the google test, I have both in one test.