This is what’s new in Firefox 18:
- NEW: Support for Retina Display on OS X 10.7 and up.
- NEW: Preliminary support for WebRTC.
- CHANGED: Experience better image quality with our new HTML scaling algorithm.
- CHANGED: Performance improvements around tab switching.
- DEVELOPER: CSS3 Flexbox implemented.
- DEVELOPER: Support for new DOM property window.devicePixelRatio.
- DEVELOPER: Support for @supports added.
- DEVELOPER: Improvement in startup time through smart handling of signed extension certificates.
- HTML5: Support for W3C touch events impemented, taking the place of MozTouch events.
- FIXED: Disable insecure content loading on HTTPS pages (62178).
- FIXED: Improved responsiveness for users on proxies (769764).