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When you run the browser, but it doesn't actually display anything on screen.

Uses include rendering a screenshot (e.g. a preview thumbnail) of some website on a server, or running automated UI tests that click around a web app and fill out forms to verify its functionality.

Thank you for taking the time to explain. I had the same question.

A headless browser is a web browser without a GUI. Extremely useful in web testing/scrapping.

Blog / forum "SEO" spam bots will also be a big use case.

Sure but they most likely already run off xvfb.

The same reasons as Chrome headless [1] but with Gecko engine.

[1] https://developers.google.com/web/updates/2017/04/headless-c...