Examine source code of Web Task Linker

{
  "manifest_version": 2,
  "name": "Web Task Linker",
  "version": "1.0",
  "description": "Attach tasks to specific websites.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{80d64efa-0834-4e38-8954-9afa64c2d88d}"
    }
  }
}