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cookie-manager
Cookie Manager for Firefox (Desktop/Android), Chrome. Supports viewing and editing of cookies and private cookies.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
In Firefox, I installed the Cookie Manager extension which allows me to quickly and easily view all cookies for a given website. Typically, most sites are going to set a cookie containing session details and the modernpo.com site is no different. After going to the site and logging in, click the Cookie Manager button and choose "Open Cookie Manager for the Current Page". The displayed "Name" and "Value" boxes give you the values you need to use.