Achim's Mozilla ExtensionsThis add-on/extension is no longer compatible with current releases of Firefox. The code is based on Mozilla's XUL- and XPCOM-APIs, which are obsolete and no longer supported. Bringing the extension back to life would require a complete rewrite using WebExtensions. Unfortunately at the moment I can't give you any details on when (or even if) I will be able to accomplish this task. I will look into
