A primitive "dump the current OneTab collection kept in my Chrome Browser" script.

onetab_backup.py

import os
from subprocess import Popen, PIPE
import binascii
import json
import ast

# An extremely primitive dump of the
# [OneTab](https://www.one-tab.com/) local database.

# Logic is derived from [Recovering data from
# LevelDB](https://antimatter15.com/2015/12/recovering-deleted-data-from-leveldb/)

onetab = os.path.expanduser("~/.config/google-chrome/Default/Local Extension Settings/chphlpgkkbolifaimnlloiipkdnihall/000005.ldb")

# This script assumes you have `ldbdump` available and installed.  If
# not, you can follow the instruction at the "Recovering data from
# LevelDB" blogpost above to find and install it.

process = Popen(["ldbdump", onetab], stdout=PIPE)
(output, err) = process.communicate()
exit_code = process.wait()

items = []
for line in (output.split("\n")[1:]):
    if line.strip() == "": continue
    parsed = ast.literal_eval("{" + line + "}")
    key = parsed.keys()[0]
    halves = key.encode('string_escape').split("\\x", 1)

    # Kevin Kwok (antimatter15, see above) asserts that this is the
    # vector clock of leveldb, and that the *last* entry is the one
    # visible in your browser's OneTab entry.

    litkey = ast.literal_eval("'\\x" + halves[1].replace("\\\\u00", "\\x") + "'")
    if len(litkey) == 8:
        time = int(binascii.hexlify(litkey[1:][::-1]), 16)
        items.append((time, halves[0], parsed[key]))

found = None        
for i in sorted(items, key = lambda k: k[0]):
    if (len(i) > 2) and (i[1] == "state"):
        found = i[2]

# OneTab stringifies its JSON payload, and LevelDB stringifies
# *that*, so we end up with having to do two loads, and then
# a pretty-print dump.
if found:
    print(json.dumps(json.loads(json.loads(found)), indent=4))