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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.
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storybook
Storybook is a frontend workshop for building UI components and pages in isolation. Made for UI development, testing, and documentation.
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videospeed
HTML5 video speed controller (for Firefox). WebExtensions port of Video Speed Controller Chrome extension. (by codebicycle)
For webkit based browsers, you can also use Video Speed Controller extension
https://github.com/igrigorik/videospeed
Anatine[0] was a Twitter client maintained by Sindre Sorhus, a popular open-source maintainer. It made use of a userscript to add extra functionality to Twitter. Sadly, this meant keeping up with Twitter's ever-changing DOM class names.
It was eventually abandoned.
[0]: https://github.com/sindresorhus/anatine
It is all one line. Yes, Twitter formats it in a way that makes it impossible to copy just the text.
Here is a repo from which it is easy to copy:
https://github.com/no-gravity/hn-bookmarklet
Many sites are turning on CSP, a web security capability which lets sites block loading content from anywhere they don't allowlist.
Userscripts will run, but if they try to load any content from elsewhere, that breaks. So, for example, the Hypothes.is extension wont load. Affected sites keep growing. https://twitter.com turned on CSP many years ago.
Here's the Firefox version (https://github.com/codebicycle/videospeed), and it's saved me so much time it's absolutely ridiculous at this point.