Examine source code of Sako plugin

{
  "manifest_version": 2,
  "name": "Sako",
  "version": "0.3.0",
  "description": "Adds articles to the Sako.",
  "homepage_url": "https://codeberg.org/bins/sako-plugin",
  "icons": {
    "48": "img/sako-icon-48.png",
    "128": "img/sako-icon-128.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "img/sako-icon-48.png",
    "default_title": "Sako"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "background": {
    "scripts": [
      "sako-plugin.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{26ccf762-1960-474a-9fb4-e1e7c4add027}"
    }
  }
}