Consolidate prefs usage in torbutton.js
In torbutton.js, we call
var pref_service = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefBranch);or
m_tb_prefs = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefBranch);7 times when that functionality is already available in Services.prefs. So I am proposing to consolidate this.
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