Examine source code of Fedishare

{
  "manifest_version": 2,
  "name": "Share-freedom",
  "description": "share the current tab on the fediverse",
  "version": "2.0",
  "author": "Mickie",
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_popup": "index.html",
    "default_title": "Share freedom",
    "theme_icons": [
      {
        "light": "img/icon-16-light.png",
        "dark": "img/icon.png",
        "size": 16
      },
      {
        "light": "img/icon-32-light.png",
        "dark": "img/icon.png",
        "size": 32
      }
    ]
  },
  "icons": {
    "16": "img/icon.png",
    "32": "img/icon.png"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      },
      "description": "Execute the extension"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "{663559a2-7735-4c62-b033-439c6c01440a}",
      "strict_min_version": "57.0a1"
    }
  },
  "permissions": [
    "activeTab",
    "storage"
  ]
}