Thanks for the feedback.

I understand the desire for wanting support for constructing feed URLs for sites that don't link to their feeds. Boring RSS is intended to be simple to maintain and predictable, so constructing feed URLs is not a suitable usecase for Boring RSS. Websites are responsible for including links to their feed in HTML headers.

I'm also disappointed that this extension always shows an icon. I'd rather it didn't, but to be able to decide whether to show the icon would require "Access to all data on your sites" permission (since that's needed to be able to search the page at any time). I've added a more detailed explanation of this to the description.