MDN wants to talk to developers like you: https://qsurvey.mozilla.com/s3/8d22564490d8

Here at MDN, we try to avoid outright deleting content that might be useful to people targeting legacy platforms, operating systems, and browsers. Perhaps your target audience is people that are using older hardware, for example, and can't upgrade to the latest and greatest browsers. Or for "reasons," your company is required to use very old software and you need to build Web content that runs on that software. Or perhaps you're just curious about the history of an obsolete feature or API, and how it worked.

There are many reasons older documentation can be useful. So, we've established this area into which we can archive older documentation. Material in this Archived content zone should not be used for building new Web sites or apps for modern browsers. It's here for historical reference only.

Note to writers: We need to try to keep the subpages here organized instead of all dumped into one large folder. Try to create subtrees for categories of material. Also, only move pages here that are extremely obsolete. If anyone might realistically need the information in a living product, it may not be appropriate to move it here. In general, it may be best to discuss it in the IRC channel #mdn before moving content here.

Archived Mozilla and build documentation
These articles are archived, obsolete documents about Mozilla, Gecko, and the process of building Mozilla projects.
Archived open Web documentation
The documentation listed below is archived, obsolete material about open Web topics.
B2G OS
Firefox OS 是由 Mozilla 打造的全新移动操作系统,基于 Linux 系统和驱动火狐浏览器的强大 Gecko 渲染引擎开发。
JXON
JXON (无损 JavaScript XML对象注释)  是一个通用名称,通过它定义使用 XML的JavaScript对象的表示。 There are no real standards for this conversion, but some conventions begin to appear on the web. There are some cases in which the whole content of an XML document must be read from the JavaScript interpreter (like for web-apps languages or settings XML documents, for example). In these cases JXON could represent the most practical way.
MDN "meta-documentation" archive
Here you'll find archived "meta-documentation"; that is, documentation about how to write documentation on MDN. The articles here are obsolete and should no longer be referenced; we are retaining them here for reference while we migrate some content to new places, but very little of this is useful.