Firefox 49 附加组件兼容性

Firefox 49 will be released on September 13th. Here’s the list of changes that went into this
version that can affect add-on compatibility. There is more information
available in Firefox 49 for Developers, so you should also give it a look.

General

• Cleanup doorhanger notification anchor ID & class duplication. This could affect the styling of add-ons that use popup notifications.
• Make a window opened through window.open() to be scrollable by default.
• Remove non-standard flag argument from String.prototype.{search,match,replace}.
• Remove HTML Microdata API.

XPCOM and Modules

• Limit the size of pref values sent to the child process.
   As a reminder, you shouldn’t use the preferences service to store large
   amounts of data. It should only be used for small values (under 4Kb).
  This bug enforces it for inter-process communication.
• Need to shim protocol.js move for add-ons. The module should now be accessed using
   require("devtools/shared/protocol"). For now, there’s a shim that permits the old location to be used.
• Add deprecation warning within nsFaviconService.cpp. If you manipulate favicons, you can find the changes described in this bug comment. After this change you’ll only see a warning if you don’t pass the right principal, but eventually it won’t work as you expect.

http://blog.mozilla.org/addons/2016/06/30/compatibility-for-firefox-49/