A python script to back up all the bookmarks(firefox compatible). It returns a dictionary with url as key and (title, tag, add_date, modified_date) tuple as the value. It also stores it in gdbm. Another script is provided to read all the bookmarks.

bookmark.py

'''
Author: Jay Rambhia
email : jayrambhia777@gmail.com
A new script supporting both Mozilla Firefox and Google Chrome bookmarks:
https://github.com/jayrambhia/Bookmark-Manager
'''
import os
import json
import pickle
import gdbm
import time

def __getPath():
	
	for path, dirs, files in os.walk(os.environ['HOME']):
		if 'bookmarkbackups' in dirs:
			break
			
	dir_path = os.path.join(path,'bookmarkbackups')
	
	if os.path.isdir(dir_path):
		return dir_path
	else:
		return None
	
def __getFile():
	
	path = __getPath()
	filename = None
	if path:
		files = os.listdir(path)
		files.sort()
		filename = os.path.join(path, files[-1])
	
	return filename
	
def getBookmarks():
	filename = __getFile()
	if not filename:
		print 'No bookmark backup found!'
		return
	bookmark_dict = getBookmarkDict(filename)
	return bookmark_dict

def getBookmarkDict(filename):
	f = gdbm.open('bookmarkDB','c')
	bookmark_dict = fetchBookmarks(filename)
	
	if bookmark_dict:
		for key in bookmark_dict:
			f[key] = pickle.dumps(bookmark_dict[key])
	
	if f.keys():		
		bookmark_dict = {}
	for key in f.keys():
		bookmark_dict[key] = pickle.loads(f[key])
	if f.has_key('@author@'):
		name, email, add_date, modified_date = pickle.loads(f['@author@'])
		modified_date = time.time()
		f['@author@'] = pickle.dumps((name, email, add_date, modified_date))
	else:
		name = 'Jay Rambhia'
		email = 'jayrambhia777@gmail.com'
		add_date = modified_date = time.time()
		f['@author@'] = pickle.dumps((name, email, add_date, modified_date))
	print 'bookmarks saved'
	f.close()	
	return bookmark_dict
		
	

def fetchBookmarks(filename):
    f = open(filename)
    con = json.load(f)
    f.close()
    bookmark_dict = {}
    # Get Bookmarks Menu / Bookmarks toolbar / Tags / Unsorted Bookmarks
    con_list = con['children'] # this list will have all of the above mentioned things
    
    for i in range(len(con_list)):
		con_sub_list = con_list[i]['children']  # Access them individually
		for tags in con_sub_list:
			if tags.has_key('children'): # Accessing Tags # get tag list
				bookmarks = tags['children'] # get all the bookmarks corresponding to the tag
				if bookmarks:
					for bookmark in bookmarks: # Access each bookmark
						Tag = tags['title']
						uri = bookmark['uri']
						title = bookmark['title']
						dateAdded =  bookmark['dateAdded'] # it gives a long int eg. 1326378576503359L
						add_date = dateAdded/1000000  # The output of time.time() would be 1326378576.503359
						lastModified = bookmark['lastModified']
						modified_date = lastModified/1000000
						bookmark_dict[uri] = (repr(title), Tag, add_date, modified_date)
						
			else:
				if (tags['title'] != 'Recently Bookmarked' 
                        and tags['title'] != 'Recent Tags' 
                        and tags['title'] != 'Most Visited' 
                        and con_list[i]['title'] != 'Bookmarks Menu'):
                    # Accessing Unsorted Bookmarks
					Tag = con_list[i]['title']
					title = tags['title']
					uri = tags['uri']
					
					dateAdded =  tags['dateAdded']
					add_date = dateAdded/1000000
                    
					lastModified = tags['lastModified']
					modified_date = lastModified/1000000
					
					bookmark_dict[uri] = (repr(title), Tag, add_date, modified_date)	
    
    return bookmark_dict

if __name__ == '__main__':
	getBookmarks()

bookmarkreader.py

'''
Author : Jay Rambhia
email : jayramhbia777@gmail.com
A new script supporting both Mozilla Firefox and Google Chrome bookmarks:
https://github.com/jayrambhia/Bookmark-Manager
'''
import gdbm
import pickle
import os

def __getDB():
	filename = __getFilename()
	if not filename:
		return
	if os.path.isfile(filename):
		db = gdbm.open(filename,'c')
		if db.has_key('@author@'):
			name, email, add_date, modified_date = pickle.loads(db['@author@'])
			if name == 'Jay Rambhia'and email == 'jayrambhia777@gmail.com':
				return db
				
	print 'Bookmark database not found'
	return None
	
def __getFilename():
	dirs = os.listdir('.')
	if 'bookmarkDB' in dirs:
		filename = 'bookmarkDB'
		file_path = os.path.join(os.path.abspath('.'),filename)
		print file_path
		
		return file_path
	else:
		print 'bookmark database not found'
		print '1. Search for bookmark database'
		print '2. Enter bookmark database name'
		print '3. Exit'
		n = int(raw_input())
		if n == 1 :
			for path, dirs, filenames in os.walk(os.environ['HOME']):
				if 'bookmarkDB' in filenames:
					break
			
			file_path = os.path.join(path,'bookmarkDB')
			return file_path
		elif n == 2:	
			filename = str(raw_input('File Name: '))
			print filename
			if os.path.isfile(filename):
				path, file_name = os.path.split(filename)
				print path
				if path:
					return filename
				file_path = os.path.join(os.path.abspath('.'),filename)
				return file_path
			else:
				print 'Bookamrk database not found'
				return None
		elif n==3:
			print 'Exit'
			return None
		else:
			__getFilename()
			
def bookmarkReader(db):
	if not db:
		return
	keys = db.keys()
	
	author_tuple = pickle.loads(db['@author@'])
	name, email, add_date, modified_date = author_tuple
	print 'Author:',name
	print 'email:',email
	
	keys.remove('@author@')
	bookmark_list = []
	for key in keys:
		bookmark_tuple = (key,pickle.loads(db[key]))
		bookmark_list.append(bookmark_tuple)
		
	bookmark_list.sort(key = lambda b:b[1][1])
	for bookmark in bookmark_list:
		print bookmark[1][0],'tag:',bookmark[1][1]
		print bookmark[0]
		print ''
	
	return
	
if __name__ == '__main__':
	db = __getDB()
	bookmarkReader(db)	

A python script supporting both Firefox and Mozilla created.
https://github.com/jayrambhia/Bookmark-Manager