It was an extension for ComfyUI, which has 37k stars on GitHub. The way ComfyUI is commonly used is that a person shares a "workflow" file, which utilizes various obscure extensions (called "custom nodes") and then the people who want to run the workflow on their own computer will install all these obscure custom nodes that have like 40 stars on GitHub or so.

Using stars as popularity doesn't work.

I have personally never starred anything that I use. And 90% of the open source that I use isn't on github.