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tampermonkey
Tampermonkey is the most popular userscript manager, with over 10 million users. It's available for Chrome, Microsoft Edge, Safari, Opera Next, and Firefox.
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crxviewer
Add-on / web app to view the source code of Chrome / Firefox / Opera 15 extensions and zip files.
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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.
People in a chat I'm in were discussing this issue and I was shocked. I always thought Tampermonkey was open-source, considering its popularity among hobbyists. I'd been using it for years to run a script that bypasses Youtube age verification without having an account.
technically extensions by design are 'open source', and u can use something like https://github.com/Rob--W/crxviewer to view the code.