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Drastically improved memory use
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
Added support for text-overflow: ellipsis
Added support for the Web Timing specification
Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Firefox. This can be enabled by installing an add-on
Fixed several stability issues
I still find FF better for browsing cause of add-ons like NoScript and AdBlock.