Examine source code of BubbleTranslate

{
  "manifest_version": 3,
  "name": "BubbleTranslate",
  "version": "3.2",
  "description": "Instant translation with beautiful popup bubbles. Select any text and translate instantly.",
  "browser_specific_settings": {
    "gecko": {
      "id": "bubbletranslate@extension.app",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "https://translate.googleapis.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon2-16.png",
      "48": "icon2-48.png",
      "128": "icon2-128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "16": "icon2-16.png",
    "48": "icon2-48.png",
    "128": "icon2-128.png"
  }
}