Using xbl documents in addon-sdk-1.4 and above is impossible but worked without problems up to 1.3. Using the following code in a contentscript results to "did not load anything" when using 1.4 and above without showing any errors. Works perfectly fine before that. self.port.on("setup", function(xml) { var xmldata = "data:text/xml;charset=utf-8,"+encodeURIComponent(xml); document.loadBindingDocument(xmldata); var tab = document.createElement("span"); document.body.appendChild(tab); document.addBinding(tab, xmldata+"#autoSelectTab1"); var l = document.getAnonymousNodes(tab); if (l == null) window.alert("did not load anything"); else window.alert("all fine"); }); you can find the example in a working addon context in the attachment. This plugin works fine before 1.4.

There is no way to unload a binding document after loadBindingDocument is used, so this cannot be used with a restartless add-on which jetpacks are.