Examine source code of Toot That!

{
  "manifest_version": 2,
  "version": "0.4.0",
  "description": "Publish the current tab URL to the Fediverse",
  "name": "Toot That!",
  "homepage_url": "https://github.com/hfiguiere/toot-that",
  "icons": {
    "48": "data/icon.svg",
    "96": "data/icon.svg",
    "128": "data/icon.svg"
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "data/icon.svg",
    "default_title": "Toot That!",
    "default_popup": "popup/tootthat.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tootthat@figuiere.net"
    }
  }
}