how to filter by webpages visited – the capture log has green, red, and other coded lines

You can use this display filter:

http.request.full_uri contains "xxxxxx"

Replace the xxxx with the websites or pages you are looking for.

http.request.full_uri contains "ask.wireshark.org"
http.request.full_uri contains "/questions"

You will then get all HTTP requests that contain those strings in the URI. Right click on one of those packets and select "Follow TCP Stream" to see the whole communication for that request.

Regards
Kurt