Here's a list of some very useful extensions you can download. I'll add more as time comes along so make sure and check this list frequently :)
First thing's first! you must have Firefox to download any of these.
Want to get on Myspace at school?
If you have any free time at school after you have finished your work or you are at lunch and what to check your myspace, you can use Concealme.in. It will let you bypass your schools security so you can go on myspace, fakebook, or any other blocked sites :)
