Examine source code of Mubi Score

{
  "name": "Mubi Score",
  "version": "0.5.2",
  "author": "Gergely Imreh",
  "developer": {
    "name": "Gergely Imreh",
    "url": "https://github.com/imrehg/mubiscore"
  },
  "description": "Add movie scores to Mubi's Now Showing page.",
  "permissions": [
    "storage",
    "https://www.omdbapi.com/"
  ],
  "icons": {
    "16": "icons/mubiscore16.png",
    "48": "icons/mubiscore48.png",
    "128": "icons/mubiscore128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/mubiscore16.png",
      "48": "icons/mubiscore48.png",
      "128": "icons/mubiscore128.png"
    },
    "default_title": "MubiScore",
    "default_popup": "options.html"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true,
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "mubiscore@imreh.net",
      "strict_min_version": "57.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://mubi.com/showing",
        "https://mubi.com/*/showing"
      ],
      "run_at": "document_idle",
      "css": [
        "content.css"
      ],
      "js": [
        "browser-polyfill.js",
        "contentScript.js"
      ]
    }
  ],
  "manifest_version": 2
}