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youtube-fast-fullscreen-toggle
A Chrome extension to avoid the lag when toggling fullscreen on a YouTube video - by hiding the heavy fluff while transitioning
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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.
Vivaldi is very bad for going fullscreen on youtube it takes many seconds even on high end pc. There is a script that try to help https://github.com/ZimbiX/youtube-fast-fullscreen-toggle the guy that made the script clearly says " In Vivaldi, there is unfortunately an intermediate step in the fullscreen transition, which I can't seem to do anything to avoid. It appears to be due to the toolbars being hidden/shown at a different moment to when the browser actually enters/leaves fullscreen. "