This is an open-source project, in case you don't feel like dropping your zip file in to your browser (even though it does run _in_ your browser):
git clone https://github.com/textileio/textile-facebook
cd textile-facebook/
python -m http.server # Python 3.x, or
python -m SimpleHTTPServer # Python 2.x
- Load the page
- Disconnect from the internet
- Drop your zip
- Get your files
- Clear all page info
(Yes, I've checked I've typed it correctly, and it's not in my junk folder.)