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How to change/increase addon/extension window size?

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When clicking on an addon icon in the toolbar, I want to increase the size of the pop up window

When clicking on an addon icon in the toolbar, I want to increase the size of the pop up window

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Unless the add-on itself provides for that, I think you will need to use userChrome.css: https://www.userchrome.org/how-create-userchrome-css.html

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I think extension authors are limited to 800 pixels wide and 600 pixels tall. If you find a way to enlarge it, please let me know!