I looked at the source code for version 1.0.0, and it looked fine to me, I didn't see anything wrong.

Extension works fine for me, no problems. I tried only the detect- and view- functionality, not the generate- functionality.

It seems a number of sites grab any attempt to view their llms.txt and redirect it to something else. I guess they don't have a real llms.txt file, and maybe don't want to support use by LLMs.