I want to make my superuser browsing a little easier, on firefox is it possible to make it so when you click this home button
It automatically redirects to the tab I use instead of going through questions then newest?
A URL redirect plugin will do what you want.
Download this plugin or any URL re-director plugin of your choice. Set it up like this and you're ready to go.
The only downside is that you can't access https://superuser.com/ without disabling the redirect as it will always redirect to this https://superuser.com/questions?tab=Newest
In Windows 10, you can make a shortcut to that page and drag it to the desktop.