Examine source code of Custom Right-Click Menu

{
  "manifest_version": 2,
  "options_ui": {
    "page": "html/options.html",
    "browser_style": true,
    "open_in_tab": true
  },
  "name": "Custom Right-Click Menu",
  "description": "Create a custom right-click menu and choose the links and scripts you want in it.",
  "version": "2.2.8",
  "short_name": "CRM",
  "applications": {
    "gecko": {
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "page": "html/background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/polyfills/browser.js",
        "js/contentscripts/contentscript.js"
      ]
    },
    {
      "matches": [
        "http://userstyles.org/*",
        "https://userstyles.org/*"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "js/polyfills/browser.js",
        "js/contentscripts/userstyles.js"
      ]
    },
    {
      "matches": [
        "https://openusercss.org/*",
        "https://openusercss.com/*"
      ],
      "run_at": "document_start",
      "all_frames": false,
      "js": [
        "js/polyfills/browser.js",
        "js/contentscripts/openusercss.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "include_globs": [
        "*.user.css",
        "*.user.style"
      ],
      "run_at": "document_idle",
      "all_frames": false,
      "js": [
        "js/polyfills/browser.js",
        "js/contentscripts/usercss.js"
      ]
    }
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';",
  "permissions": [
    "<all_urls>",
    "activeTab",
    "contextMenus",
    "storage",
    "tabs",
    "management",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking"
  ],
  "web_accessible_resources": [
    "js/jquery-2.0.3.js",
    "js/crmapi.js",
    "html/install.html",
    "html/logging.html"
  ],
  "optional_permissions": [
    "bookmarks",
    "clipboardRead",
    "clipboardWrite",
    "cookies",
    "history",
    "idle",
    "notifications",
    "topSites",
    "webNavigation"
  ],
  "commands": {
    "crm_command_01": {
      "description": "CRM Keyboard Shortcut number 1"
    },
    "crm_command_02": {
      "description": "CRM Keyboard Shortcut number 2"
    },
    "crm_command_03": {
      "description": "CRM Keyboard Shortcut number 3"
    },
    "crm_command_04": {
      "description": "CRM Keyboard Shortcut number 4"
    },
    "crm_command_05": {
      "description": "CRM Keyboard Shortcut number 5"
    },
    "crm_command_06": {
      "description": "CRM Keyboard Shortcut number 6"
    },
    "crm_command_07": {
      "description": "CRM Keyboard Shortcut number 7"
    },
    "crm_command_08": {
      "description": "CRM Keyboard Shortcut number 8"
    },
    "crm_command_09": {
      "description": "CRM Keyboard Shortcut number 9"
    },
    "crm_command_10": {
      "description": "CRM Keyboard Shortcut number 10"
    }
  },
  "incognito": "spanning",
  "icons": {
    "16": "icon-supersmall.png",
    "48": "icon-small.png",
    "128": "icon-large.png"
  }
}