Firefox Session Saver

#!/usr/bin/env python
import json
import os, os.path

DEFAULT_PROFILE_NAME = "default.2m2"
SESSION_PATH = "Library/Application Support/Firefox/Profiles/%s/sessionstore.js"

# TODO consider generalizing the session store to open (different users, different profiles)
def session_path():
    return os.path.join(os.environ['HOME'],SESSION_PATH % DEFAULT_PROFILE_NAME)

def load_session():    
    f = open(session_path())
    s = f.read()
    s = s[1:-1] # strip parentheses to make pure python json object
    return json.loads(s)

def decompose_session():
    windows = []
    for window in load_session()['windows']:
        tabs = []
        windows.append(tabs)
        for tab in window['tabs']:
            if len(tab['entries']) != 0:
                tabs.append({ 'url': tab['entries'][-1]['url'],
                              'title': tab['entries'][-1]['title'],
                })
    return windows
    
def dump_session():    
    for w,window in enumerate(decompose_session()):
        for t,tab in enumerate(window):
            print "%3i %3i %s" % (w,t,tab['title'].encode("utf-8"))
            print "       %s" % tab['url'].encode("utf-8")
            print

def tab_count():
    return sum(map(len,[w for w in decompose_session()]))

if __name__ == "__main__":
    dump_session()
    print
    print "%i total tabs" % tab_count()
    print