Play with Docker

PWD is a Docker playground which allows users to run Docker commands in a matter of seconds. It gives the experience of having a free Alpine Linux Virtual Machine in browser, where you can build and run Docker containers and even create clusters in Docker Swarm Mode.

The 'daddy' of play-with-k8s.com

Play with Kubernetes

PWK is a K8s playground which allows users to run K8s clusters in a matter of seconds. It gives the experience of having a free Alpine Linux Virtual Machine in browser. Under the hood Docker-in-Docker (DinD) is used to give the effect of multiple VMs/PCs.

CodePen

Front End Developer Playground & Code Editor in the Browser

Ready2Search

Create custom search plugins for Firefox. Neat!

Can I use... Support tables for HTML5, CSS3, etc

"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.

How to lose weight (in the browser)

And what if we got together a bunch of experts who work on large sites to create a definitive front-end performance guide?

And not just one of those boring guides made for robots, what if we did something fun?  That's exactly what we've done! And we'll guide you in this battle to create even faster sites.

Although I'm not a front-end dev this may come in handy sometime.

MediathekViewWeb

MediathekViewWeb ist eine einfache Browser-Oberfläche für den Zugriff auf die Filmliste des MediathekView Projekts.

Content Security Policy

As made clear by the CSP spec, browser bookmarklets shouldn't be affected by CSP. [..]

But, none of the browsers get this correct. All cause CSP violations and prevent the bookmarklet from functioning.

Though its highly discouraged, you can disable CSP in Firefox as a temporary workaround. Open up about:config and set security.csp.enable to false.

Finally I can bookmark github.com pages though my Firefox bookmarklets again. Wasn't aware that CSP was the culprit...