Examine source code of Ads and tracker blocker

{
  "manifest_version": 2,
  "name": "Ads and tracker blocker",
  "version": "1.0",
  "description": "Blocks ads and trackers using EasyList and EasyPrivacy lists.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://big.oisd.nl/*",
    "<all_urls>",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{52cffc1b-cd90-431d-a660-7652ac64b23e}"
    }
  }
}