Examine source code of HTTPS-Upgrader

{
  "manifest_version": 2,
  "name": "HTTPS-Upgrader",
  "description": "Find unsafe links during a browsing session on the internet",
  "version": "1.0",
  "default_locale": "en",
  "homepage_url": "https://gitlab.ti.bfh.ch/barts5/https-upgrader",
  "icons": {
    "256": "icons/projectIcon/H-UG-icon256.png"
  },
  "applications": {
    "gecko": {
      "id": "@H-UG",
      "strict_min_version": "42.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "js/jquery-3.4.1.min.js",
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/jquery-3.4.1.min.js",
      "background/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/projectIcon/H-UG-icon16.png",
      "32": "icons/projectIcon/H-UG-icon32.png",
      "256": "icons/projectIcon/H-UG-icon256.png"
    },
    "default_popup": "popup/popup.html",
    "default_title": "HTTPS-Upgrader"
  },
  "content_security_policy": "default-src 'self'; script-src 'self'; style-src 'self'",
  "permissions": [
    "activeTab",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "storage",
    "*://*/*",
    "ftp://*/*"
  ],
  "web_accessible_resources": [
    "icons/projectIcon/H-UG-iconOpen256.png"
  ]
}