Examine source code of CardDAV Browser

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "7.0",
  "author": "Michael Talbot",
  "applications": {
    "gecko": {
      "id": "carddavbrowser@mtalbot.addons.mozilla.org",
      "strict_min_version": "78.0"
    }
  },
  "icons": {
    "16": "content/images/icon16.png",
    "24": "content/images/icon24.png",
    "36": "content/images/icon36.png",
    "48": "content/images/icon48.png",
    "64": "content/images/icon64.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "content/background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "content/images/icon16.png",
      "24": "content/images/icon24.png",
      "36": "content/images/icon36.png",
      "48": "content/images/icon48.png",
      "64": "content/images/icon64.png"
    },
    "default_title": "__MSG_extensionName__"
  },
  "permissions": [
    "<all_urls>"
  ]
}