Print out the URLs in the tabs currently in Firefox on macOS.

firefox-tabs

#!/usr/bin/env python3

import argparse
import json
import pathlib

# You'll need to install python-lz4: https://pypi.org/project/lz4/
import lz4.block

parser = argparse.ArgumentParser(description="List open urls in Firefox tabs")
args = vars(parser.parse_args())


def dump_urls(filepath: pathlib.Path):
    stream = open(filepath, "rb")
    stream.read(8)  # skip past the b"mozLz40\0" header
    compressed_bytes = stream.read()
    uncompressed_bytes = lz4.block.decompress(compressed_bytes)
    text = uncompressed_bytes.decode("utf-8")
    data = json.loads(text)
    for window in data["windows"]:
        for tab in window["tabs"]:
            for entry in tab["entries"]:
                print(entry["url"])


if __name__ == "__main__":
    home = pathlib.Path.home()
    firefox = home / "Library" / "Application Support" / "Firefox"
    profiles = (firefox / "Profiles").glob("*.default-release")
    for profile in profiles:
        recovery = profile / "sessionstore-backups" / "recovery.jsonlz4"
        if recovery.exists():
            dump_urls(recovery)