The `self` module provides access to data that is bundled with the add-on as a whole. It also provides access to the [Program ID](dev-guide/addon-development/program-id.html), a value which is unique for each add-on. Note that the `self` module is completely different from the global `self` object accessible to content scripts, which is used by a content script to [communicate with the add-on code](dev-guide/addon-development/content-scripts/using-port.html). @property {string} This property is a printable string that is unique for each add-on. It comes from the `id` property set in the `package.json` file in the main package (i.e. the package in which you run `cfx xpi`). While not generally of use to add-on code directly, it can be used by internal API code to index local storage and other resources that are associated with a particular add-on. Eventually, this ID will be unspoofable (see [JEP 118](https://wiki.mozilla.org/Labs/Jetpack/Reboot/JEP/118) for details). @property {string} This property contains the add-on's short name. It comes from the `name` property in the main package's `package.json` file. @property {string} This property contains the add-on's version string. It comes from the `version` property set in the `package.json` file in the main package. @property {object} The `data` object is used to access data that was bundled with the add-on. This data lives in the main package's `data/` directory, immediately below the `package.json` file. All files in this directory will be copied into the XPI and made available through the `data` object. The [Package Specification](dev-guide/addon-development/package-spec.html) section explains the `package.json` file. @method The `data.load(NAME)` method returns the contents of an embedded data file, as a string. It is most useful for data that will be modified or parsed in some way, such as JSON, XML, plain text, or perhaps an HTML template. For data that can be displayed directly in a content frame, use `data.url(NAME)`. @param name {string} The filename to be read, relative to the package's `data` directory. Each package that uses the `self` module will see its own `data` directory. @returns {string} @method The `data.url(NAME)` method returns a url that points at an embedded data file. It is most useful for data that can be displayed directly in a content frame. The url can be passed to a content frame constructor, such as the Panel: var self = require("self"); var myPanel = require("panel").Panel({ contentURL: self.data.url("my-panel-content.html") }); myPanel.show(); @param name {string} The filename to be read, relative to the package's `data` directory. Each package that uses the `self` module will see its own `data` directory. @returns {String}