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<!DOCTYPE html>
<script>
function done(exists) {
parent.postMessage(exists, '*');
}
function fail() {
parent.postMessage("FAIL", '*');
}
navigator.serviceWorker.getRegistration(".").then(function(reg) {
if (reg) {
reg.unregister().then(done.bind(undefined, true), fail);
} else {
dump("getRegistration() returned undefined registration\n");
done(false);
}
}, function(e) {
dump("getRegistration() failed\n");
fail();
});
</script>