Custom search always loads browser?

[wilb]

I spotted #100 but I think this is a different issue...

I've configured a custom search provider against my self hosted Jackett instance, and when I search for something it passes the search through correctly, but the results appear in the browser rather than being parsed by Transdroid. My default browser is Vivaldi, but this also happens if I switch to Chrome, Firefox or Edge. I've also tried via https reverse proxy or via local access - the result is the same.

Any idea how I can get Transdroid to parse the results itself rather than jump out to the browser?