CID automatically updated to the newest version, and now all of my legacy add-ons are disabled.
That's why I switched to CID from Firefox, so I'm not a happy camper.

Short of doing a restore, how can I get back to an earlier version that keeps the add-ons?
You maybe able to install version 52 over it. (your profile is in your username/appdata folders.) Or use portable install where you can just make a copy of the folder in its entirety for backup.
Note to all whom are going to install Comodo IceDragon v57.0.4.44, KNOW it's based on Firefox Quantum 57.0.1 codebase.
Which means ALL old pre-57 addons will NOT work. You'll need to reget all your addons, IF they even have comparable ones to get.
It's not Comodo's fault, it is the new Firefox 57 that made security changes to add-ons.
Me, I'm still keeping v52 portable, but will install v57 portable to a different folder, and try to find the same add-ons I had; because the Find Replacement button doesn't take you to a replacement, just to it's add-on page...
This way I still can use a fully functional browser, while getting the new one in line.
Now if all you use is an AD blocker, then you're all set to go with v57.