@manueljordan The procedure would be... to build and install it yourself. It uses webkit2gtk-4.0 or webkit2gtk-4.1. If you use 4.1, it will conflict with some other plugins: webhelper, markdown, updatechecker, geniuspaste. They are being updated, but I wouldn't expect rebuilds on most distros until the next release.
Looks like Peppermint is based on Debian Bookworm, so I'd expect the [build instructions](https://github.com/xiota/geany-preview/blob/main/docs/Building_on_Linux.md) to work with minimal changes. If not, feel free to open a new issue on the project page.
In terms of features, it's basically complete. I don't intend to turn it into a general web browser. The problem is the code isn't very maintainable.