how to use firefox to visit google ？？？

hello all: i'm in china (not hongkong or taiwan) the f*cking government entirely forbid google and gmail these days althought i can use some proxy software like ULTRA-SURF, but it only works on Windows and IE is there any proxy software easy to use on Linux ？？？ best Regards！ Xu Yi Ping ――Don't let the past limit the future