uninstall this now if you have it. it's not the official extension. get the one from github.

Don't use this extension! Use the real X-Kit instead.

What are with the permissions required for this? Access all data? Unlimited amount of client side data stored?

Use the official version

I'm one of the developers of New XKit. This version is not official, and should not be used. There is no guarantee that our updates to the core addon will be published here, so please install New XKit from https://github.com/new-xkit/XKit/releases/latest for the latest features and security fixes.

Tumblr is a lot better with it but the permissions for it are really troubling. Access all data? Super extreme and with the way identity theft is now how are they storing all that data or even doing with it?

The permissions this extension needs make me worried a bit. Permission to access all data of all websites? Be careful!