You can launch Firefox using Geckodriver from WSL, here's Hal Wine's code, thanks Hal!

Pontifications

Beyond mere opening Firefox tabs from WSL, You can launch Firefox using Geckodriver from WSL, here’s a chat about Hal Wine ‘s code.
Hal wrote in chat:

I did a python module to login to GitHub with 2FA: 
https://github.com/mozilla/GitHub_Selenium/blob/master/github_selenium/__init__.py

which is called from: 
https://github.com/mozilla/github-org-scripts/blob/master/lfs.py

iirc, geckodriver (not the python wrapper to it) has all the page load fu. 

Like: 
https://github.com/mozilla/github-org-scripts/blob/master/lfs.py

I wonder if then if ruby WATIR and all that other QA / run your browser works in WSL too!