A light Firefox edition. Many components are slimmed down. So it can start faster and use less memory. By default, Light can run along with official firefox. Both x86 and x64 builds are available.
http://sourceforge.net/projects/lightfirefox/?source=navbar
Light is firefox slim & lite edition..........firefox is bad but Light is good
please make the portable version official , of course this is open source
Doesn't keep pace with Firefox releases, which means it's inherently unsafe to use.
Also there is likely to be little enthusiasm here for developing and/or releasing "yet another Firefox variant", unless you can make an exceptionally convincing case. "slim & lite" just doesn't cut it as there are already plenty of alternatives with established track records.