Taking a Full Webpage Screenshot using Firefox

If you need to take a screenshot of the entire webpage, you can use Firefox's built in command line feature to achieve it.

Press Shift + F2, a command line prompt will appear at the bottom-left part of the browser window.
Type screenshot --fullpage and press enter. The page will be saved in your default download location.

There are other options available on the command line which can be looked up using the command help
Firefox Shift F2 Command Line Help

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