Just follow the following steps and you will be able to login in gmail
and orkut with multiple accounts. Through this you will be able to make
profiles in your firefox.
Open system properties(by
right clicking my computer), choose tab advanced, click to environment
variables button. in system variables section, click new. type this
information to each textbox.
variable name: moz_no_remote (should be all small letter).
variable value: 1
firefox icon's properties(from desktop and quick launch). add extension
-p to command line(like "c:\program files\mozilla firefox\firefox.exe"
-p). press ok.
When you will open firefox it will prompt for profile
selection create a profile,open firefox login to orkut open once more
use another profile login.