The Burning Edge

Speed & memory:

• Fixed: 715402 - Wait until chrome is painted before executing code not critical to making the initial window visible.
• Fixed: 756313 - Don't load homepage URI before first paint.
• Fixed: 750417 - Closing a tab reflows the entire tab bar during the animation, making the animation crappy.
• Fixed: 811176 - Clean up JIT code more aggressively.

For more, read Taras's Snappy blog and Nick's MemShrink blog.

New web technologies:

• Fixed: 115199 - Implement CSS2 @page.
• Fixed: 503720 - Implement CSS3 viewport-size units.
• Fixed: 685012 - Implement page-break-inside: avoid.
• Fixed: 648610 - Implement <canvas>.toBlob.
• Fixed: 800983 - Implement getDefaultComputedStyle, which computes style taking only UA and user sheets into account.
• Fixed: 715798 - [Mac] Add color emoji support. 😀

For more, read Firefox 19 for developers.

Security improvements:

• Fixed: 799009 - Remove support for obsolete SSL-related warning prompts.
• Fixed: 788653 - Make enablePrivilege pref name more dire.
• Fixed: 801576 - Align Gecko and the spec on cross-origin access to window.history.
• Fixed: 803181 - Change update background download interval from 10 minutes to 1 minute and update check interval from 24 hours to 12 hours.

Other notable fixes:

• Fixed: 661881 - Implement about:telemetry.
• Fixed: 486918 - [Windows, Linux] Improve image downscaling.

All 3995 changes between FIREFOX_AURORA_18_BASE and FIREFOX_AURORA_19_BASE