Hope you're still updating this...
I'm on the latest version 1.0.18 and using Chrome 65.0.3325.181 on Win 10. The latest update to Chrome extensions has caused a possible bug in the options page of this extension. See screenshot:
There are more options below "HamStare", but they are inaccessible. A scroll bar is not there as well.
I suspect this is due to Chrome defaulting to "chrome_style": "true" in the manifest.json, and I think a simple CSS fix would be to just set the proper width and height properties. A quick test with width: 1000px; on <body> did the trick.
Most importantly, the "Save" button is hidden, and I was unable to get to it through overflow: scroll.