Examine source code of Elink - Bookmark Manager

{
  "manifest_version": 2,
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "img/icon_toolbar.png",
      "38": "img/icon_toolbar@2x.png"
    },
    "default_title": "Save to elink"
  },
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "content_scripts": [
    {
      "js": [
        "js/content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    },
    {
      "js": [
        "sdk/inboxsdk.js",
        "js/gmail.js"
      ],
      "matches": [
        "https://mail.google.com/*",
        "https://inbox.google.com/*"
      ]
    }
  ],
  "permissions": [
    "*://*/*",
    "<all_urls>",
    "contextMenus",
    "tabs",
    "activeTab"
  ],
  "web_accessible_resources": [
    "html/frame.html",
    "img/icon_48.png"
  ],
  "name": "Elink - Bookmark Manager",
  "version": "3.1.1",
  "description": "Best visual Bookmarker for creating content for your Gmail Newsletters, HTML Newsletters, Website/Blog and Social bio links.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c45d4ef-12c2-439b-9aba-10abb430e35b}"
    }
  }
}