Is there a way to detect page loaded event when navigating topics

This isn't really supported currently, however, there's this hack you can do: (and the below function, loadPageJson, is the one that logs the message you noticed)

debiki2.Server.loadPageJson = function(path, origOnDone) {
  origLoadPageJson(path, function(response) {
    origOnDone(response);
    // setTimeout so your code won't run until after page updated.
    setTimeout(function() { console.log("*** Loaded new page: " + path + ", your own code here ***"); });
  });
}

This monkey-patches the function that loads new pages, and runs your own code, after the new JSON has been loaded and the page updated.

However this is fragile. The name debiki2 is old, it'll change to maybe talkyard, and then your code will break. Also, it'll break if I change the internal implementation of loadPageJson. Or some time in the distant future, when json is cached, browser side, and not always loaded from the server.

This could perhaps work, though, as a temporary hack? And then maybe there could be an officially supported callback, for navigation events?

An alternative could be to monkey-patch history.pushState:

var origPushState = history.pushState;
history.pushState = function() {
  console.log("Loading new page, arguments: " + JSON.stringify(arguments));
  origPushState.apply(history, arguments);
};

However pushState happens before the JSON for the new page has been loaded and the new page actually shown.

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What's your use case?

JS code that adds a link text when a page is loaded

Maybe you'd like to post a screenshot? I'm having a hard time imagining how this looks / works :- )