Examine source code of Cliption

{
  "manifest_version": 2,
  "name": "Cliption",
  "description": "Clip the interesting facts and statistics you never want to forget",
  "version": "2.2.1resigned1",
  "author": "zfoster",
  "background": {
    "scripts": [
      "jquery-2.1.4.min.js",
      "selection-sharer.js",
      "background.chrome.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icon-16x16.png",
    "default_title": "Cliption extension"
  },
  "content_scripts": [
    {
      "js": [
        "jquery-2.1.4.min.js",
        "selection-sharer.js",
        "jquery.highlight.js",
        "findAndReplace.js",
        "content_script.chrome.js"
      ],
      "css": [
        "selection-sharer.css"
      ],
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "*://www.cliption.com/*",
        "*://staging.cliption.com/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icon-16x16.png",
    "48": "icon-48x48.png",
    "128": "icon-128x128.png"
  },
  "permissions": [
    "tabs",
    "contextMenus"
  ],
  "externally_connectable": {
    "matches": [
      "*://localhost/*",
      "*://www.cliption.com/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7a260548-bdf4-4f8c-992f-866ffa1202c7}"
    }
  }
}