Examine source code of Simply Mastodon Share

{
  "manifest_version": 2,
  "name": "Mastodon Share",
  "version": "0.1",
  "default_locale": "en",
  "description": "Share links on Mastodon",
  "browser_specific_settings": {
    "gecko": {
      "id": "mastodonshare@slamkode.ml",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "mastodonshare.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/mastodon-share-light.svg",
    "default_title": "Share on Mastodon",
    "default_popup": "popup.html",
    "theme_icons": [
      {
        "light": "icons/mastodon-share-light.svg",
        "dark": "icons/mastodon-share-dark.svg",
        "size": 16
      },
      {
        "light": "icons/mastodon-share-light.svg",
        "dark": "icons/mastodon-share-dark.svg",
        "size": 32
      }
    ]
  }
}