gistfile1.py

#!/usr/bin/python
from tweetstream import ReconnectingTweetStream
import pprint
import os

USER = "your user"
PASSWD = "your password"

FOXPATH = "~/firefox3.5/firefox/firefox %s"

ts = ReconnectingTweetStream(USER, PASSWD, url="gardenhose")

for tweet in ts:
    if tweet.has_key('user'):
        #print "<%s>\t%s" % (tweet['user']['screen_name'], tweet['text'])
        idx = tweet['text'].find('http://')
        if idx != -1:
            url = tweet['text'][idx:]
            print url
            os.system(FOXPATH % (url))
    else:
        pass