In this case backups only help with reverting, but not with moving forward because even the backups would corrupt once they're used by the new version.
I ended up copy / pasting any text that I could from my extension settings into a text file and then took screen shots of any settings screens to re-create them all.
I don't use AdBlock so I don't know how complicated it settings are for re-creating in that manner.
Frankly I don't use AdBlock and other extensions like it because I haven't found one yet that doesn't decrease the loading performance of the browser.
