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Discontinued. The replacement is "Smart Zoom" - https://addons.mozilla.org/en-US/firefox/addon/smart-zoom/
This add-on has been marked as experimental by its developers
About this Add-on
Zoomr has been discontinued as of August 26th, 2016. A replacement with all requested features has been created in a joint effort with Franceso. It is called "Smart Zoom" and is found here - https://addons.mozilla.org/en-US/firefox/addon/smart-zoom/