Today I landed a patch that enables a security feature for extensions.
 Now when an extension runs a content script, that script runs in a
"parallel universe" with the page.  In its isolated world, the content
script can see the page's DOM, but it can't see any of the page's
JavaScript objects.  This helps protect the extension from getting
hacked by the page's JavaScript.  If you're interested in how a page
can hack a non-isolated content script, you might enjoy reading
http://www.adambarth.com/papers/2009/adida-barth-jackson.pdf

This is a "breaking change" in the sense that it changes the content
script's API (by hiding the page's JavaScript).  If you notice your
favorite user script acting up after this change, please let me know
and we'll try to get to the bottom of the issue.

Adam

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