gecko/toolkit/content/tests/widgets/use_large_cache.js

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(function() {
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
// Set cache size to something large
var prefService = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefService);
var branch = prefService.getBranch("media.");
var oldSize = branch.getIntPref("cache_size");
branch.setIntPref("cache_size", 40000);
window.addEventListener("unload", function() {
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
branch.setIntPref("cache_size", oldSize);
}, false);
})();