monitoring history.pushstate from a chrome extension

Not sure whether you trying to do this in background.js or content.js, but if it is the former, you can do so using webNavigation events:

You need to set permissions for webNavigation in manifest.json:

  "permissions": [

Then in background.js:

  chrome.webNavigation.onHistoryStateUpdated.addListener(function(details) {
        console.log('Page uses History API and we heard a pushSate/replaceState.');
        // do your thing

Source: Chrome Extension docs for webNavigation

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