Not a lawyer. Showing people examples of a website really looks like you're advertising that your extension will work with that site, and it's probably not too

Not a lawyer. Showing people examples of a website really looks like you're advertising that your extension will work with that site, and it's probably not too far from successfully arguing intent. So begin by getting rid of that. Maybe add a couple disclaimers: "The terms of service of some websites do not allow automated workflows. This extension is not intended to be used to collect data in contradiction to a site's Terms of Service. Please thoroughly read and understand the site's Terms of Service before using this extension. [Developer] cannot assume any responsbility for any action a website may take against you or your account as a result of the use of this tool."