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<!-- This Source Code Form is subject to the terms of the Mozilla Public
- License, v. 2.0. If a copy of the MPL was not distributed with this
- file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
<script>
if ("addon" in window) {
addon.port.on('X', function(msg) {
// last message
addon.port.emit('X', msg + '3');
});
// start messaging chain
addon.port.emit('Y', '1');
}
</script>
SIDEBAR TEST
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