v3.3.630 has been released which finally includes housekeeping of firewall rules!
After installing it did a pretty good job of clearing out the 200+ old firewall entries I had for Opera. There was still a handful left and I had to delete the corresponding entries in the Inactive Apps category in GlassWire.
Looking through Inactive Apps I have hundreds of entries for updaters of Office, Teams, Edge, Creative Cloud. All of these have still have firewall rules. Anything other than the most recent version is just bloat. Version information is only shown when you click on an entry and the ordering in GlassWire appears to be quite random; e.g. v114, 101, 114, 106, 109, 103, 105. So entries have to be checked and deleted one-by-one which makes cleaning up the entries incredibly tedious.