Just to clarify: The XModule should still work with V3.3.3, but we did not test it. If it does not work, it could be, for example, that a recent Chrome update is causing a problem with the old versions.
For the free/open-source Kantu we officially only support and test the latest version of Kantu with the latest versions of Chrome/Firefox plus the latest XModules version. These combinations alone are already quite a lot of SQA and regression testing work for every release.
For professional use we offer the Kantu Enterprise plan - this includes the option to avoid automatic Chrome extension updates.