In the Firefox address bar, enter about:profiles and press Enter.
Click the Open folder button on the Root Directory entry.
You should see a folder called bookmarkbackups
Double-click on the folder and you should see a list of backup files.
To restore one of those, click on Bookmarks in the Firefox toolbar and click on Show All Bookmarks.
Click on Import and Backup and click on Restore.
I can find no setting in CCleaner that will delete the bookmarks file (places.sqlite) or extensions (it will delete saved passwords, which actually should not be stored in the browser).
If you have a full disk image backup, you might consider restoring your profile folder from that.
Extensions are fairly easy to re-download and install from Firefox AMO.
Otherwise you may need to download another Piriform tool called Recuva, and use that to find your bookmarks backup files that were deleted...if they have not been overwritten.
Edited by jwoods301, 25 June 2017 - 01:30 AM.