New

• Send and open a tab from one device to another with Sync

• Windows 8 touch screen support for multiprocess Firefox

• Pages containing insecure password fields now display a warning directly within username and password fields.

Changed

• Removed Battery Status API to reduce fingerprinting of users by trackers

• Removed NPAPI support for plugins other than Flash. Silverlight, Java, Acrobat and the like are no longer supported.

• Implemented the Strict Secure Cookies spec which forbids insecure (http:) sites from setting cookies with the "secure" attribute, and in some cases prevents an insecure site from setting a cookie with the same name as an existing "secure" cookie from the same base domain.

• Improved experience for downloads:

• Notification in the toolbar when a download fails

• Quick access to five most recent downloads rather than three

• Larger buttons for canceling and restarting

• Improved text input with some third-party keyboard layouts on Windows, e.g., keyboard layouts which have chained dead keys, inputs two or more characters with a non-printable key or a dead key sequence, inputs a character even when a dead key sequence failed to compose a character.

Developer

• Responsive Design Mode redesigned and enhanced with device selection, network throttling, and more

• Screen sharing shows a preview and no longer requires a whitelisted domain

• Enabled CSS Grid Layout