Where I can subscribe a list of Javascript API to be obsoleted before the browser release?

I am just hitting a bug due to Firefox 7 has removed some non-standard attribute (they hav开发者_开发知识库e no moz- prefix) and cause my scripts fail on Firefox7. Ref: https://developer.mozilla.org/en/DOM/File

In order to prevent it happen again. I am interesting to get a list of API to be obsoleted. So that I can handle them before the browser release, without testing twenty alpha/beta/nightly build of browsers everyday.

It there any page, blog, or RSS who give warning before the feature disappear?

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You cannot get fast and easy warnings about future changes. But here are some blogs for you, where you can read about changes that just got implemented:

• IE Blog - http://blogs.msdn.com/b/ie/
• Opera Desktop Team - http://my.opera.com/desktopteam/blog/
• Webkit changelogs in human language, by Peter Beverloo - http://peter.sh
• Firefox changelog monitor - http://www.squarefree.com/burningedge/