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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/. -->
+
+# Low-Level APIs #
+
+Modules in this section implement low-level APIs. These
+modules fall roughly into three categories:
+
+* fundamental utilities such as
+[collection](modules/sdk/util/collection.html) and
+[url](modules/sdk/url.html). Many add-ons are likely to
+want to use modules from this category.
+
+* building blocks for higher level modules, such as
+[events](modules/sdk/events/core.html),
+[worker](modules/sdk/content/worker.html), and
+[api-utils](modules/sdk/deprecated/api-utils.html). You're more
+likely to use these if you are building your own modules that
+implement new APIs, thus extending the SDK itself.
+
+* privileged modules that expose powerful low-level capabilities
+such as [window/utils](modules/sdk/window/utils.html) and
+[xhr](modules/sdk/net/xhr.html). You can use these
+modules in your add-on if you need to, but should be aware that
+the cost of privileged access is the need to take more elaborate
+security precautions. In many cases these modules have simpler,
+more restricted analogs among the "High-Level APIs" (for
+example, [windows](modules/sdk/windows.html) or
+[request](modules/sdk/request.html)).
+
+These modules are still in active development, and we expect to
+make incompatible changes to them in future releases.
+
+
+<ul id="module-index"></ul>