Examine source code of CleanCites

{
  "manifest_version": 2,
  "name": "CleanCites",
  "version": "1.1",
  "description": "A simple Firefox/Chromium extension to help hide or highlight citations in browser based scientific journals.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "permissions": [
    "<all_urls>",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/48.png",
    "default_title": "CLean Cites",
    "default_popup": "popup/clean_cites.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/textmanip.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{820627c5-c279-4719-bee5-30497588b031}"
    }
  }
}