Examine source code of Friends+Me

{
  "name": "__MSG_appName__",
  "manifest_version": 2,
  "description": "__MSG_appDescription__",
  "short_name": "__MSG_appShortName__",
  "icons": {
    "16": "icons/icon-16.png",
    "128": "icons/icon-128.png"
  },
  "default_locale": "en",
  "homepage_url": "https://friendsplus.me",
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "css": [
        "styles/googleplus.css"
      ],
      "js": [
        "scripts/googleplus-inject.js"
      ],
      "all_frames": true,
      "matches": [
        "*://plus.google.com/*"
      ]
    },
    {
      "js": [
        "scripts/shareimage-inject.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    },
    {
      "js": [
        "scripts/share.js"
      ],
      "css": [
        "styles/share.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "19": "icons/icon-19.png",
      "38": "icons/icon-38.png"
    },
    "default_title": "Friends+Me"
  },
  "web_accessible_resources": [
    "icons/icon-19.png",
    "icons/icon-38.png",
    "icons/icon-128.png"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "Command+Shift+K"
      },
      "description": "Share with Friends+Me"
    },
    "share": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "Command+Shift+K"
      },
      "description": "Share with Friends+Me"
    }
  },
  "version": "1.7.15resigned1",
  "applications": {
    "gecko": {
      "id": "alois@loysoft.com"
    }
  }
}