Looks like only recently opened tabs (or some variation on that) show up here. To test, reload all tabs In one window (I used an extension) and check out chrome://inspect again. It's all there. Maybe there's a good reason for not showing all pages in inspect. Who knows. Another problem is that my script grabs page subprocess urls also. I've mainly used this for grabbing my android tabs.

This is an adapted version that skips grabbing subprocesses

  collection = document.getElementById("pages").getElementsByClassName("subrow"); final_output_tsv = "title\turl\n"; for (let item of collection) {if(new RegExp("([a-zA-Z0-9]+://)?([a-zA-Z0-9_]+:[a-zA-Z0-9_]+@)?([a-zA-Z0-9.-]+\\.[A-Za-z]{2,4})(:[0-9]+)?(/.*)?").test(item.children[0].innerHTML) === false) final_output_tsv += `${item.children[0].innerHTML}\t${item.children[1] ? item.children[1].innerHTML : "N/A"}\n`}; copy(final_output_tsv)

edit: I used reload all tabs extension with reload all tabs in all windows option turned on. This could get messy.