Update deleted extensions

It sure would be nice if I got a notice prior to updating that it would remove certain extension. I use session manager and had a lot stored in it, now it’s gone. So before I attempt to reinstall the extension in hopes that my data is still there and it picks it up, any suggestion where I might be able to look on my computer to find the files originally associated with the extension? Maybe I can located the file containing all my saved links for my sessions and restore them manually.