This setting is hard-coded in the Ubuntu Firefox Modifications add-on:
$ grep middlemouse /usr/share/xul-ext/ubufox/defaults/preferences/ubuntu-mods.js
pref("middlemouse.contentLoadURL", false); // setting to false disables pasting urls on to the page
This overrides any user-specified setting saved in .mozilla/firefox/[profile]/prefs.js, but also overrides any setting stored in user.js even though user.js is supposed to take precedence.
This setting is hard-coded in the Ubuntu Firefox Modifications add-on:
$ grep middlemouse /usr/share/ xul-ext/ ubufox/ defaults/ preferences/ ubuntu- mods.js "middlemouse. contentLoadURL" , false); // setting to false disables pasting urls on to the page
pref(
This overrides any user-specified setting saved in .mozilla/ firefox/ [profile] /prefs. js, but also overrides any setting stored in user.js even though user.js is supposed to take precedence.