about_config_export.py

import json
import pathlib

from bs4 import BeautifulSoup

# read the file
root = pathlib.Path.cwd()
file = root / "about_config.html"
html_doc = file.read_text().replace("\n", "")

# parse html
html = BeautifulSoup(html_doc, "html.parser")

# locate prefs
prefs_container = html.find(id="prefs-container")

# collect settings
settings = {}

for i in prefs_container.children:
    settings[i.attrs["name"]] = {
        k: v for k, v in i.attrs.items() if k in ["value", "default"]
    }
    settings[i.attrs["name"]]["type"] = i.find("input").attrs["type"]

# save non-default settings js file (same format as prefs.js and user.js)
file_js = root / "about_config.js"

user_prefs_js = ""

for k, v in settings.items():
    # skip non-default
    if v["default"] == "true":
        continue
    value = v["value"] if v["type"] != "text" else f'"{v["value"]}"'
    user_pref = f'user_pref("{k}", {value});\n'
    user_prefs_js += user_pref

file_js.write_text(user_prefs_js)

# save all settings as json file
file_json = root / "about_config.json"

with file_json.open("w") as target_json:
    json.dump(settings, target_json, indent=4)