Access https://infosimples.github.io/detect-headless to run several headless detection tests against your browser.

• User Agent: in a browser running with puppeteer in headless mode, user agent includes Headless.

• App Version: same as User Agent above.

• Plugins: headless browsers don't have any plugins. So we can say that if it has plugin it's headful, but not otherwise since some browsers, like Firefox, don't have default plugins.

• Plugins Prototype: check if the Plugin and PluginsArray prototype are correct.

• Mime Type: similar to Plugins test, where headless browsers don't have any mime type

• Mime Type Prototype: check if the MimeType and MimeTypeArrayprototype are correct.

• Languages: all headful browser has at least one language. So we can say that if it has no language it's headless.

• Webdriver: this property is true when running in a headless browser.

• Time elapse: it pops an alert() on page and if it's closed too fast, means that it's headless.

• Chrome element: it's specific for chrome browser that has an element window.chrome.

• Permission: in headless mode Notification.permission and navigator.permissions.query report contradictory values.

• Devtool: puppeteer works on devtools protocol, this test checks if devtool is present or not.

• Broken Image: all browser has a default nonzero broken image size, and this may not happen on a headless browser.

• Outer Dimension: the attributes outerHeight and outerWidth have value 0 on headless browser.

• Connection Rtt: The attribute navigator.connection.rtt,if present, has value 0 on headless browser.

• Mouse Move: The attributes movementX and movementY on every MouseEvent have value 0 on headless browser.