/usr/share/xul-ext/video-without-flash/content/prefs.js is in xul-ext-video-without-flash 3.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | function getGenericPref(branch,prefName)
{
    switch (branch.getPrefType(prefName))
    {
        default:
        case 0:   return undefined;                      // PREF_INVALID
        case 32:  return getUCharPref(prefName,branch);  // PREF_STRING
        case 64:  return branch.getIntPref(prefName);    // PREF_INT
        case 128: return branch.getBoolPref(prefName);   // PREF_BOOL
    }
}
function setGenericPref(branch,prefName,prefValue)
{
    switch (typeof prefValue)
    {
      case "string":
          setUCharPref(prefName,prefValue,branch);
          return;
      case "number":
          branch.setIntPref(prefName,prefValue);
          return;
      case "boolean":
          branch.setBoolPref(prefName,prefValue);
          return;
    }
}
function setDefaultPref(prefBranch, prefName, prefValue)
{
    var defaultBranch = Services.prefs.getDefaultBranch(prefBranch);
    setGenericPref(defaultBranch,prefName,prefValue);
}
function getUCharPref(prefName,branch)  // Unicode getCharPref
{
    branch = branch ? branch : Services.prefs;
    return branch.getComplexValue(prefName, Components.interfaces.nsISupportsString).data;
}
function setUCharPref(prefName,text,branch)  // Unicode setCharPref
{
    var string = Components.classes["@mozilla.org/supports-string;1"]
                           .createInstance(Components.interfaces.nsISupportsString);
    string.data = text;
    branch = branch ? branch : Services.prefs;
    branch.setComplexValue(prefName, Components.interfaces.nsISupportsString, string);
}
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