Examine source code of Element Blocker Plus

{
  "manifest_version": 2,
  "name": "Element Blocker Plus",
  "version": "1.0",
  "description": "Block unwanted page elements with a click.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c754bba5-6224-46b9-a79b-14880b79a1b7}",
      "strict_min_version": "100.0"
    }
  }
}