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copied!<blockquote> <p>I don't want to bother learning the old methods if they are slated to be removed</p> </blockquote> <p>There are no plans now, or in the future, to remove legacy add-on support. At least that's what add-on SDK folks and extension manager folks told me repeatedly.</p> <p>Back to your question: The add-on sdk does not provide an explicit API for stuff like this, but you can always go even more low-level, even in the SDK (via the <a href="https://addons.mozilla.org/en-US/developers/docs/sdk/latest/dev-guide/tutorials/chrome.html" rel="nofollow"><code>chrome</code></a> module and/or <a href="https://addons.mozilla.org/en-US/developers/docs/sdk/latest/modules/sdk/window/utils.html" rel="nofollow"><code>window/utils</code></a>).</p> <p>To implement additional compression methods, you'd need to implement the <a href="http://mxr.mozilla.org/mozilla-central/source/netwerk/streamconv/public/nsIStreamConverter.idl" rel="nofollow"><code>nsIStreamConverter</code></a> interface and properly register your component under the <code>@mozilla.org/streamconv;1@?from=<yourcompression>&to=uncompressed</code> contract. Then Firefox should be able to decode <code>yourcompression</code>.</p> <ul> <li>See <a href="https://developer.mozilla.org/" rel="nofollow">https://developer.mozilla.org/</a> for more information on how to implement and register XPCOM components in either javascript or C++.</li> <li>Using the SDK or implementing your add-on restartless will require you register the component yourself instead of relying on chrome.manifest. There are a couple of add-on doing so already, e.g. <a href="https://hg.adblockplus.org/adblockplus/file/0d76ad7eb80b/lib/contentPolicy.js#l365" rel="nofollow">Adblock Plus</a>.</li> <li>Binary (C++) components should be avoided because you'll obviously need to compile your component for each supported platform and you'll need to re-compile it for each Gecko version. If you have to go binary, a javascript component stub + <a href="https://developer.mozilla.org/en-US/docs/Mozilla/js-ctypes" rel="nofollow">js-ctypes</a> might be better.</li> <li>See the mozilla source code on how to <a href="http://mxr.mozilla.org/mozilla-central/ident?i=nsIStreamConverter" rel="nofollow">implement <code>nsIStreamConverter</code></a> in the first place.</li> </ul> <p>You may also need to modify the <code>network.http.accept-encoding</code> preference so that the compression may be actually negotiated with the server.</p>

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