
EDIT: Version 0.10 was released in April 2020 https://addshore.com/2020/04/add-exif-data-back-to-facebook-images-0-10/
In 2016 I wrote a blog post with this exact title when moving all of my pictures from Facebook to Google photos. I wrote a hacky little script which met my needs and added exif data from a HTML Facebook data dump back to the images that came along with it.
A few months ago I took another look at the script and made it slightly easier to run, but it still fell short on the usability side of things.
Since then more and more people have and been commenting and messaging me wanting to do exactly the same thing, and so I finally made a more usable version of my little tool.