[Bug 240133]

[danny0838]

RFC 2557 MHTML is a standarized format for web page archive that deemed
to be directly readable for web browsers and is already supported by
many browsers such as IE and Chrome.

However, Firefox does not directly support it. Although we currently
have addons like MAF (https://addons.mozilla.org/zh-tw/firefox/addon
/mozilla-archive-format/) or UnMHT (https://addons.mozilla.org/zh-
tw/firefox/addon/unmht/), they are written in XUL/XPCOM, which is going
to be deprecated, and their functionality is currently not available in
WebExtension, the exclusively addon system in the future.

Therefore, we need a support for RFC 2557 MHTML support, at least a directly reading, and saving at best. This could either be:
1. Directly support for MHTML reading and writing
2. Add enough API to allow an addon like MAF or UnMHT in WebExtension

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https://bugs.launchpad.net/bugs/240133

Title:
  MHTML Format - Web Archive Files - Standard not supported in Firefox

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