Examine source code of AKTA logger

{
  "name": "AKTA logger",
  "description": "Adds server logs sent from PHP (via ChromePhp) to browser console",
  "version": "1.22resigned1",
  "manifest_version": 2,
  "homepage_url": "https://addons.mozilla.org/ro/firefox/addon/akta-logger/",
  "author": "nicu alcea",
  "developer": {
    "name": "nicu alcea",
    "url": "https://github.com/alceanicu/akta-logger"
  },
  "applications": {
    "gecko": {
      "id": "akta.logger@niku.alcea",
      "strict_min_version": "57.0"
    }
  },
  "browser_action": {
    "default_icon": "icons/icon38_disabled.png",
    "default_title": "Logger"
  },
  "background": {
    "scripts": [
      "background_scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content_scripts/log.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "webRequest",
    "tabs",
    "<all_urls>",
    "storage"
  ]
}