Examine source code of Not Just Analytics

{
  "browser_specific_settings": {
    "gecko": {
      "id": "andrea@notjustanalytics.com",
      "strict_min_version": "59.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "edit-dom.js"
      ],
      "matches": [
        "https://*.instagram.com/*",
        "https://www.instagram.com/*",
        "*://instagram.com/*"
      ]
    },
    {
      "js": [
        "ext_conn.js"
      ],
      "matches": [
        "https://*.business-ig.test/*",
        "https://*.notjustanalytics.com/*"
      ]
    }
  ],
  "default_locale": "en",
  "description": "Help to use Not Just Analytics: Best Instagram Analysis Tool",
  "icons": {
    "16": "images/ninja16.png",
    "32": "images/ninja32.png",
    "48": "images/ninja48.png",
    "128": "images/ninja128.png"
  },
  "manifest_version": 2,
  "name": "Not Just Analytics",
  "page_action": {
    "default_icon": {
      "16": "images/ninja16.png",
      "32": "images/ninja32.png",
      "48": "images/ninja48.png",
      "128": "images/ninja128.png"
    },
    "default_popup": "popup.html",
    "show_matches": [
      "https://*.instagram.com/*",
      "https://*.business-ig.test/*",
      "https://*.notjustanalytics.com/*"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "cookies",
    "*://*/*"
  ],
  "version": "0.0.2"
}