Examine source code of Manga Translator

{
  "manifest_version": 2,
  "name": "__MSG_default_title__",
  "description": "__MSG_description__",
  "version": "4.1.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "64": "icon/64.png",
    "128": "icon/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "sidePanel",
    "storage",
    "contextMenus",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "static/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "static/lib/cropper.min.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_title": "TranslateManga Online"
  },
  "browser_action": {
    "default_title": "Manga CC"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "Manga_Translator@translatemanga.online"
    }
  }
}