Examine source code of Chicken Climate

{
  "manifest_version": 2,
  "name": "Climate chicken",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "<all_urls>"
  ],
  "description": "Replace the hyperbolic, fanatic lanaguage of climate changed being snuck into the media, with comical replacements",
  "version": "1.1",
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "default_popup": "popup.html"
  },
  "page_action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "page.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "chickenclimate@gmail.com",
      "strict_min_version": "59.0"
    }
  }
}