This release addresses problems with disabled IDE themes and Delphi 10.2 Tokyo releases below 10.2.3 (and some smaller bugs):
https://www.mmx-delphi.de/2018/12/31/bugfix-release-for-mmx-code-explorer/
Prompted by a suggestion from Peter Aschbacher I just added a new feature to my Delphi Help Expert:
You can now force it to use the default web browser instead of the Welcome Page for web URLS.
https://blog.dummzeuch.de/2019/01/01/new-option-in-delphi-help-expert-to-open-in-web-browser/