Xoom Redirector

I can't get this to work at all (Linux) -- please help debug

I'm a huge fan of the concept of this extension, but I can't get it to work.

I've installed it on Chrome on Ubuntu 20.04and visited a few different zoom.us links multiple times, and the `/s/<ID>` is not redirected to `/wc/<ID>` as intended. The extension appears to do nothing, and I'm not sure how to debug it. I've looked at the code and am software capable, but know very little about Chrome extensions.

Because I know other things might interfere with this extension, I did restart Chrome and try again, and I also allowed it in Incognito Mode and attempted to use it there, also without any effect.

Can you help me debug and figure out what's going on?