Add captive portal helper for non-GNOME desktop users
I prefer the light-weight Epiphany (3.22.7 on the 64-bit Devuan distro) than Firefox. In order to make it usable, there are two issues it need to address:
- In Germany, people in libraries login to public WiFi network by opening the browser and it prompts to open the network login page (on https://www.hotspot.de/) However, Epiphany never has prompt the login and I had to open Firefox for that.
Edited by Michael Catanzaro