Bare minimum Chrome extension to inject a JS file into the given page when you click on the browser action icon. The script then inserts a new div which contains a button element into the DOM! The function of the button is to remove google ads class from current site.

background.js

// this is the background code...

// listen for our browserAction to be clicked
chrome.browserAction.onClicked.addListener(function (tab) {
	// for the current tab, inject the "inject.js" file & execute it
	chrome.tabs.executeScript(tab.ib, {
		file: 'inject.js'
	});
});

inject.js

// this is the code which will be injected into a given page...
// containing function to create a div element attached to a button sub element
// the button removes all "adsbygoogle" classes from "ins" elements within the page.
// 
(function() {

	// just place a div at top right
	var div = document.createElement('div');
	div.style.position = 'fixed';
	div.style.top = 0;
	div.style.right = 0;
	div.textContent = 'Injected!';
	document.body.appendChild(div);
	var btn = document.createElement('button');
	btn.style.position = 'fixed';
	btn.style.backgroundColor = 'dodgerblue';
	btn.style.color = 'white';
	btn.textContent = 'Remove Google Ads';
	alert('Google Ad Removal Button!');

})();

manifest.json

{
  "name": "Grief",
  "version": "0.0.0",
  "manifest_version": 1,
  "description": "Injecting a button to remove googleAds class from current site",
  "homepage_url": "http://youtube.com/user/hakdmodz/videos/index.html",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": { "16": "googleTrashed-Spun.png",
           "48": "googleTrashed-Spun.png",
          "128": "googleTrashed-Spun.png" },
  "browser_action": {
    "default_title": "Grief"
  },
  "author": "HaKDMoDz™",
  "permissions": [
    "https://*/*",
    "http://*/*",
    "tabs"
  ]
}

my fork version attempts to remove those annoying google ads from a web page by using
danharper/background.js injection script for chrome browser extension.