Examine source code of Multitran popup

{
  "manifest_version": 2,
  "default_locale": "en",
  "description": "__MSG_description__",
  "name": "__MSG_name__",
  "short_name": "Multitran-popup",
  "version": "3.0.3",
  "homepage_url": "https://github.com/flytaly/multitran-extension",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "101.0",
      "id": "multitran@flytaly"
    }
  },
  "background": {
    "scripts": [
      "./dist/background/background.js"
    ]
  },
  "permissions": [
    "storage",
    "contextMenus",
    "https://www.multitran.com/*",
    "https://*.wiktionary.org/api/*",
    "https://*.wikimedia.org/*"
  ],
  "browser_action": {
    "default_title": "__MSG_extension_title__",
    "default_icon": {
      "16": "images/icon_light-16.png",
      "32": "images/icon_light-32.png",
      "64": "images/icon_light-64.png"
    },
    "theme_icons": [
      {
        "dark": "images/icon-16.png",
        "light": "images/icon_light-16.png",
        "size": 16
      },
      {
        "dark": "images/icon-32.png",
        "light": "images/icon_light-32.png",
        "size": 32
      },
      {
        "dark": "images/icon-64.png",
        "light": "images/icon_light-64.png",
        "size": 64
      }
    ],
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "templates.html",
    "dist/styles.css",
    "images/flags/*.svg"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+M"
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "dist/content/content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "icons": {
    "48": "images/icon_light-48.png",
    "64": "images/icon_light-64.png",
    "96": "images/icon_light-96.png",
    "128": "images/icon_light-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}