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View-Image-Info-Reborn-for-Firefox
Firefox extension to restore View Image Info functionality to the right-click context menu
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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.
Add-ons can intercept requests and modify Accept headers globally (example) or based on parameters added to the URL (example) but I don't know how easily they can define new script methods that you could use in a page, if that is a requirement, or determine that it is the first GET request in a tab, if that is a requirement.
Add-ons can intercept requests and modify Accept headers globally (example) or based on parameters added to the URL (example) but I don't know how easily they can define new script methods that you could use in a page, if that is a requirement, or determine that it is the first GET request in a tab, if that is a requirement.