Chrome extension to close idle open tabs

Question

So I have two questions here. The first is:

I am trying to write a code for an extension that closes idle open tabs in Google Chrome after a set amount of time. For testing, I have made this set time to be 10 seconds. This is my manifest.json

{
  "manifest_version": 3,
  "name": "Idle Tab Closer",
  "version": "1.0",
  "permissions": ["tabs", "idle"],
  "background": {
    "service_worker": "background.js"
  }
}

And this is my background.js

chrome.idle.onStateChanged.addListener((state) => {
  if (state === "idle") {
    chrome.tabs.query({}, (tabs) => {
      const currentTime = Date.now();
      const tenSeconds = 10 * 1000; // 10 seconds in milliseconds

      tabs.forEach((tab) => {
        chrome.tabs.get(tab.id, (currentTab) => {
          if (currentTab.lastFocusedWindow && currentTab.lastFocusedWindow.focused) {
            const tabLastActive = currentTab.lastFocusedWindow.focusedTime || currentTab.lastFocusedWindow.timestamp;
            if (currentTime - tabLastActive > tenSeconds) {
              chrome.tabs.remove(tab.id);
            }
          }
        });
      });
    });
  }
});

But this code does not work. It does not result in errors, but the tabs still do not close after this set amount of time. What I do is I switch to a tab and then wait for the other tabs to close but they never do.

The second question is simple: Is there a place to keep asking questions safely and get help with my project without spamming stackoverflow or get into risk of having my account closed?

Thank you!