I love uMatrix, but all evidence is that they stopped developing it in 2021.

https://github.com/gorhill/uMatrix

I don't know the implications of that, it's the only tool I've ever found that lets me feel in control of what programs my browser is executing.

I think uMatrix is the better extension. I use it in tandem with uBO.

But yeah, Raymond didn't have the resources to develop both at once and chose uBO which offered a more digestible, install-and-forget experience palatable to a wider audience.

Raymond basically said uMatrix was feature complete. But there could be bugs.