The biggest of those are all in the performance department, including "significantly" reduced memory usage (up to 50 percent less in some cases), and a new version of the hardware-accelerated Canvas that promises to speed up HTML5 sites.
Also making its debut is a new Telemetry feature that lets users anonymously provide browser performance data to Mozilla if they choose to opt-in.
The Firefox 7 has the following changes:
- Drastically improved memory handling for certain use cases
- Added a new rendering backend to speed up
- Canvas operations on Windows systems
- Bookmark and password changes now sync almost instantly when using Firefox Sync
- The 'http://' URL prefix is now hidden by default
- Added support for text-overflow: ellipsis
- Added support for the Web Timing specification
- Enhanced support for MathML
- The WebSocket protocol has been updated from version 7 to version 8
- Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Firefox
- Fixed several stability issues
- Fixed several security issues
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