Add Firefox profile and config

.mozilla/firefox/profiles.ini

@@ -0,0 +1,8 @@
+[General]
+StartWithLastProfile=1
+
+[Profile0]
+Name=rick
+IsRelative=1
+Path=rick.profile
+Default=1

.mozilla/firefox/rick.profile/user.js

@@ -0,0 +1,6 @@
+// Display a blank new tab
+user_pref("browser.newtabpage.enabled", false);
+user_pref("browser.newtab.url", "about:blank");
+
+// Fix dark GTK themes
+user_pref("widget.content.gtk-theme-override", "Arc");