This is a meta bug for tracking the implementation of WebIntents. Patches that implement this feature should be marked as blocking this bug.
WebIntents made Sencha's 2012 HTML5 wishlist:
(In reply to comment #1)
> WebIntents made Sencha's 2012 HTML5 wishlist:
Yep, we want it!
All Web Intents code has been removed in bug 109501.