shaikhsajid1111/facebook_page_scraper ? reverse-engineered prompt

Build me a Python library that can scrape public Facebook pages or groups from the browser, without needing an API key, and return the post data in a clean structured format.

I want to be able to pass in a page or group name, choose how many posts to grab, pick Chrome or Firefox, optionally use a proxy, run headless, and set a timeout. It should also support logging in with a username and password from env vars when needed, but keep that clearly optional because it can be risky.

The main output should be a JSON style result with fields like post id, page name, shares, reaction counts, comments, text content, posted date, images, videos, and post URL. Also add a simple way to export the same data directly to a CSV file.

Please make it easy to install and use from a single class, and include a small test or example script that shows scraping a page like Meta and saving the results. If you need to check current browser automation details online, go ahead.