Examine source code of Free Comments on sites

{
  "name": "Free Comments on sites",
  "short_name": "FreeComments",
  "version": "0.0.3resigned1",
  "manifest_version": 2,
  "description": "Free comments on any site",
  "icons": {
    "16": "icons/loozicon16.png",
    "48": "icons/loozicon48.png",
    "128": "icons/loozicon128.png"
  },
  "homepage_url": "https://loozlooz.com",
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Free comments!",
    "default_icon": {
      "16": "icons/loozicon16.png",
      "48": "icons/loozicon48.png",
      "128": "icons/loozicon128.png"
    }
  },
  "permissions": [
    "https://*/*",
    "http://*/*",
    "tabs",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6c4e0d80-7209-439c-80e6-5bf5d6ea7946}"
    }
  }
}