You can load the script into violentmonkey (minus the last line because it kept refreshing the page) and it’s applied automatically that way. You can also submit it to GreasyFork to make it searchable.
Personally I find chat models that don’t provide sources to be completely useless, that’s why I use Perplexity (occasionally).
You can’t:
The answer it provided me prior to this, I know from actual research, was completely wrong.