Examine source code of Clip to DEVONthink

{
  "manifest_version": 2,
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "name": "Clip to DEVONthink",
  "version": "1.5.3",
  "description": "Clip selected web content to your DEVONthink database. Press Shift-Control-C to activate from the keyboard.",
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "icons": {
    "16": "button/add16.png",
    "32": "button/add32.png",
    "64": "button/add64.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "16": "button/add16.png",
      "32": "button/add32.png",
      "64": "button/add64.png"
    },
    "default_title": "Clip to DEVONthink"
  },
  "commands": {
    "activate": {
      "suggested_key": {
        "default": "Ctrl+Shift+C",
        "mac": "MacCtrl+Shift+C"
      },
      "description": "Open Clip to DEVONthink"
    }
  },
  "homepage_url": "http://devontechnologies.com/redirect.php?id=download-extras",
  "browser_specific_settings": {
    "gecko": {
      "id": "Clip-to-DEVONthink@devon-technologies.com"
    }
  }
}