Examine source code of Share on Mastodon

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Share on Mastodon"
  },
  "options_ui": {
    "page": "options.html"
  },
  "description": "Share your current tab on Mastodon.",
  "homepage_url": "https://anqou.net/share-on-mastodon/",
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "manifest_version": 2,
  "name": "Share on Mastodon",
  "version": "0.0.2",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "{9e001ae0-5467-4695-81c9-b055019a16fe}"
    }
  }
}