chrome extension background console.log visible in newtab console

Question

For some reason console.log that I'm using in my background script are visible in the newtab page console.

Is this suppose to be this way? I thought they should be isolated.

newtab.js

chrome.runtime.sendMessage({
  name: 'messageIncoming',
  data: 'yo',
});

background.js

chrome.runtime.onMessage.addListener((data, sender) => {
  console.log('background onMessages', data);
  switch (data.name) {
    case 'messageIncoming':
      return new Promise((resolve) => {
        resolve();
      });

    default:
      break;
  }
});

both consoles show same message.

background onMessages ....