I spent several hours trying to figure out why the fish shell configuration page (which is a dynamically generated local web page) wouldn't work, including uninstalling the snap version of Firefox and using apt to try to install the normal version of Firefox. Because neither version of Firefox could open the page, I spent hours trying to diagnose why the fish shell wasn't working properly. Eventually, I installed a different browser and it worked. I finally figured out that it was because Canonical tricked me into re-installing the snap version of Firefox via apt even though that is clearly not what I wanted. I'm still a bit salty about it.