Karma plugin not starting properly. Follow

Hello, I was walking a fellow dev through the process of setting up a debug configuration for our karma based javescript tests and ran into this issue.

We've installed the karma plugin and configured the karma debug configuration as per directions (and exactly as my working system is configured).

We installed the Chrome extension as per instructions...

We run the target from Intellij..

The Chrome instance is started, shows a message "Jetbrains IDE is debugging this browser" but the IDE just hangs with a message that it's waiting for connection. The mechanics look correct, but what connection might Inteillij be waiting for? Also, the url that the Chrome instance shows is:

chrome-extension://hmhgeddbohgjknpmjagkdomcpobmllji/loading.html?url=http%3A%2F%2Flocalhost%3A9876%2Fdebug.html

which is completely different when I run... it's simply http://localhost/debug.html