Examine source code of Numeric Grades

{
  "name": "__MSG_extName__",
  "version": "0.2.7resigned1",
  "manifest_version": 2,
  "description": "__MSG_extDescription__",
  "homepage_url": "https://popmun.do",
  "icons": {
    "64": "icons/red-64.png",
    "128": "icons/red-128.png"
  },
  "applications": {
    "gecko": {
      "id": "numericgrades@dolm.us",
      "strict_min_version": "48.0a1"
    }
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "lib/jquery-2.2.1.min.js",
      "src/background/options.js",
      "src/background/notifications.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/red-128-borderless.png",
    "default_title": "Numeric Grades",
    "default_popup": "html/options.html"
  },
  "options_ui": {
    "page": "html/options.html",
    "chrome_style": true
  },
  "permissions": [
    "*://*.popmundo.com/*",
    "tabs",
    "storage",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://popmundo.com/*",
        "http://popmundo.com/*",
        "https://*.popmundo.com/*",
        "http://*.popmundo.com/*"
      ],
      "js": [
        "src/content/numericGrades.js",
        "lib/favico-0.3.10.min.js",
        "src/content/notifications.js",
        "lib/ractive.0.9.10.runtime.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "/src/inject/menuNotifications.js"
  ]
}