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* Relaxed the default search engine enforcement, now only on install and upgrade.
Some users complained about not being able to set Ecosia as default search engine.
* Removed some bugs related to New Tab Page / Home Page being changed on the browser startup.
* Fixed Yahoo search bug appearing on empty search terms.
* Fixed Yahoo layout bug hiding Ecosia notification.
* Added hiding of add-on related messages on Ecosia site.
* Fixed improper default home page URL.
* Reduced start up code.