Some of the larger changes in Mozilla are done in branches. This way it can be developed and tested before it makes it's way into the main trunk.
Some of the interesting branches are:
- Keep GIFs at original 8 bit or optimized. This will reduce footprint.
- Major architectural changes in bookmarks code. Fixes loads of bookmark bugs.
- Loading images from content rather than layout. Could shave of 200-250ms of total page load.
- Smooth scrolling. Like we know it from Internet Explorer.
View all of the Mozilla branches.