The new Awesome Bar address bar with larger font.
The old address bar is smaller, the distance between the addresses suggests smaller.
In recent versions, Mozilla has removed the animated effects for tabs when you drag web tags from one location to another or completely pull that tab out of its own window. However, to FF 17, the company brought this feature back.
Firefox 17 is integrated with a Social API that allows you to log into social networks right in your browser. Currently, this feature only supports Facebook. Once activated, you can chat with friends, view notifications, make friends, and text in a sidebar on your browser. To activate this feature there will be two ways: access the link to Facebook to activate Firefox Messenger, or access about: config (enter about: config on the address bar and enter), set the value at the social line .enabled to "true".
Click-To-Play is a security feature introduced in Firefox 14 that helps you disable the entire plugin by default, allowing you to activate the plugin manually when you need it to access a website. In Firefox 17, this feature also reminds you whether the Adobe Flash or Silverlight version has been updated to the latest version, to help users avoid the risk of being attacked by using Flash versions, Silverlight old.
Firefox 17 will support the notification center (Notification Center) on Mountain Lion OS. This feature doesn't seem to work in Beta and hopefully coming to the stable version released tomorrow, hopefully this problem will be fixed.