Examine source code of Text Content Editor

{
  "manifest_version": 2,
  "name": "Text Editor",
  "version": "1.0",
  "description": "Edit text anywhere on websites",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "32": "Icon32.png",
    "64": "Icon64.png",
    "96": "Icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "Icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "styles.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fd3b5bef-2a4b-4988-8312-e56296099e70}"
    }
  }
}