Examine source code of FormVisualizer

{
  "description": "A small Firefox extension for web app security testers (aka. pentesters). It allows visualizing and manipulating form elements and clearing cookies and local storage data with a single action.",
  "manifest_version": 2,
  "name": "FormVisualizer",
  "version": "1.3.2",
  "homepage_url": "https://github.com/t-tera/FormVisualizer",
  "icons": {
    "48": "icons/icon.svg"
  },
  "permissions": [
    "<all_urls>",
    "menus",
    "browsingData",
    "webRequest"
  ],
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "FormVisualizer",
    "default_popup": "popup/menu.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "js/content/cs_main.js"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [],
  "background": {
    "scripts": [
      "js/common/cm_main.js",
      "js/background/bg_main.js"
    ]
  },
  "commands": {
    "form-visualizer.clear-cookies": {
      "suggested_key": {
        "default": "Alt+Ctrl+D",
        "mac": "Alt+MacCtrl+D"
      },
      "description": "Clear cookies and storage data"
    },
    "form-visualizer.tgl-visualize-form": {
      "suggested_key": {
        "default": "Alt+Ctrl+F",
        "mac": "Alt+MacCtrl+F"
      },
      "description": "Visualize form"
    },
    "form-visualizer.show-source": {
      "suggested_key": {
        "default": "Alt+Ctrl+S",
        "mac": "Alt+MacCtrl+S"
      },
      "description": "Show source"
    }
  }
}