[tokenizerrr]

This depends on what/how the extension is accessing the network. They have a background page and they can inject scripts on visited pages. If they are injecting scripts which then make the requests then it would show up in the DevTools on the page you are visiting, but this is uncommon.

Instead it is far more likely for the extension to make the requests from their background page (which has elevated permissions) which is essentially its own page with its own inspector. You can inspect each extension individually by going to your extension listing, enabling developer mode and inspecting the background page of the extension you suspect.