edit: er, I think that that also suggests that I need to restart firefox more often...
I have this set as my homepage in Firefox as moz-extension://<extension-id>/index.html, and this has not changed since installing the extension. The page still works.
Enjoy the fingerprinting.
If you don't, you have a lot more to worry about beyond fingerprinting...
Oh and I'm on LINUX (CachyOS) mind you.