Examine source code of Insert Text

{
  "manifest_version": 2,
  "name": "Insert Text",
  "version": "1.1",
  "description": "Insert pre-defined messages into text fields.",
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "webNavigation"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "options_page": "manage.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e25429ec-f019-4c92-914a-aa9b04d61e10}"
    }
  }
}