Chrome extension page action appearing outside of address bar
It appears like this is the result of a new update to Chrome, with the developers probably reasoning that most users would not know that they had extensions installed otherwise.
Link to announcement: https://groups.google.com/a/chromium.org/forum/#!searchin/chromium-extensions/upcoming/chromium-extensions/7As9MKhav5E/dNiZDoSCCQAJ
It doesn't look like extension developers can do anything about this, but I really hope Google reverts this change.