var { classes: Cc, interfaces: Ci, utils: Cu } = Components; Cu.importGlobalProperties(["File"]); var file; addMessageListener("file.open", function (stem) { try { if (!file) { file = Cc["@mozilla.org/file/directory_service;1"] .getService(Ci.nsIProperties).get("TmpD", Ci.nsIFile); file.append(stem); file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600); } sendAsyncMessage("file.opened", { fullPath: file.path, leafName: file.leafName, domFile: new File(file), }); } catch(e) { sendAsyncMessage("fail", e.toString()); } }); addMessageListener("file.remove", function () { try { file.remove(/* recursive: */ false); file = undefined; sendAsyncMessage("file.removed", null); } catch(e) { sendAsyncMessage("fail", e.toString()); } });