Examine source code of Disable Ads

{
  "name": "Disable Ads",
  "version": "0.2.1resigned1",
  "manifest_version": 2,
  "description": "Disable Ads add on will help you remove ads in video player. Current it working with fptplay.net ads. In the future, it will support more site!",
  "homepage_url": "http://virtualjame.com",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "src/bg/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icons/icon-64.png",
    "default_title": "Disable Ads"
  },
  "permissions": [
    "webRequest",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "id": "@com.virtualjame.disableads",
      "strict_min_version": "57.0a1"
    }
  }
}