Since Firefox 57, the --screenshot flag allows you to take screenshots of websites. The basic usage is as follows: /path/to/firefox -P my-profile -headless --screenshot https://developer.mozilla.org/ This creates a full-height screenshot of https://developer.mozilla.com/en-US/ called screenshot.png, in the active directory, with a viewport width of 800px. You can omit -headless when using --screen
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