firefox: Rudimentary config, tridactyl support

hm/desktop/default.nix

@@ -8,12 +8,12 @@ in
     ./audio
     ./autorandr
     ./background
+    ./browser
     ./frobar
     ./i3.nix
     ./lock
     ./mpd
     ./presentation
-    ./qutebrowser.nix
     ./redness
     ./screenshots
     ./terminal
@@ -67,7 +67,6 @@ in
           };
         };
       };
-      qutebrowser.enable = true;
     };
 
     xdg = {
@@ -143,9 +142,7 @@ in
         # data management
         freefilesync
 
-        # browsers
-        firefox
-
+        # misc
         gnome.gedit
         feh
         zbar