Examine source code of Click Copy Link

{
  "manifest_version": 2,
  "name": "Click Copy Link",
  "version": "1.0.2",
  "short_name": "ccl",
  "homepage_url": "https://github.com/tsaost/copylink",
  "description": "Hover over a link and copy using Ctrl-C/Cmd-C, or click on it with middle mouse button while holding the shift key.  You can also copy multiple links using shfit + left mouse click.",
  "applications": {
    "gecko": {
      "id": "clickcopylink.t_s_a_o_s_t@gmail.com"
    }
  },
  "background": {
    "scripts": [
      "console.js",
      "background-copylink.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "console.js",
        "content-script-copylink.js"
      ],
      "css": [
        "copylink.css"
      ]
    }
  ],
  "icons": {
    "48": "icons/link48.png",
    "96": "icons/link96.png",
    "128": "icons/link128.png",
    "225": "icons/link225.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/link48.png",
      "96": "icons/link96.png",
      "128": "icons/link128.png",
      "225": "icons/link225.png"
    },
    "default_title": "Click Copy Link"
  },
  "permissions": [
    "tabs",
    "storage",
    "contextMenus",
    "clipboardRead",
    "clipboardWrite"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}