I don’t see why it wouldn’t be possible to swap out the docker container running Chrome with another that is running Chromium or Firefox. The only interaction with the browser itself is via Selenium, which should be agnostic. I just went with what ChatGPT was able to suggest immediately.
I should clarify this is running a headless browser, so you don’t actually need Chrome installed, it exists entirely within the confines of the container and is completely ephemeral. You could also modify this to work with the standard Selenium webdriver and your installed browser of choice, but I made this with the intention of running it on my server rather than my personal machine.