"By the way, you can download the binaries from Mozilla.org rather than
compiling it yourself."
What binaries? All Mozilla offers for GNU/Linux are the tarballs I've
downloaded and am trying to install.
Regarding Firefox over Abrowser: I like Firefox's artwork, hate the name
"Abrowser" and its generic icon, and it's for the sake of webpages that
expect one of the "big five" browsers (Chrome, Firefox, IE, Opera, Safari).
Besides, I've already removed Abrowser.
This is my second biggest annoyance about GNU/Linux. It's such a pain to
install software without an Internet connection.