Examine source code of Sociocaster

{
  "manifest_version": 2,
  "name": "Sociocaster",
  "description": "This extension helps Sociocaster's users to share,schedule, and save content from the internet",
  "version": "1.8resigned1",
  "browser_action": {
    "default_icon": {
      "19": "logo_icon_19.png",
      "38": "logo_icon_38.png"
    },
    "default_title": "Sociocaster"
  },
  "background": {
    "scripts": [
      "jquery-2.1.1.min.js",
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "js": [
        "jquery-2.1.1.min.js",
        "inject.js",
        "hover-button.js"
      ],
      "matches": [
        "*://*/*"
      ]
    },
    {
      "css": [
        "sc-facebook.css"
      ],
      "js": [
        "sc-facebook.js"
      ],
      "matches": [
        "*://*.facebook.com/*"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "activeTab",
    "https://*.sociocaster.com/*",
    "storage"
  ],
  "web_accessible_resources": [
    "hover-icon@2x.png",
    "hover-icon@1x.png"
  ],
  "homepage_url": "https://sociocaster.com",
  "icons": {
    "16": "logo_icon_small.png",
    "48": "logo_icon_large.png",
    "128": "logo_icon_128.png"
  },
  "applications": {
    "gecko": {
      "id": "sociocaster@sociocaster.com",
      "strict_min_version": "48.0"
    }
  }
}