Examine source code of ichi-moe-extension

{
  "manifest_version": 2,
  "name": "ichi-moe-extension",
  "description": "Adds a context menu item for quickly looking up the selected text on ichi.moe",
  "version": "1.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus"
  ],
  "icons": {
    "16": "ichi-16.png",
    "32": "ichi-32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{14b9402c-379d-4faf-be76-ca1cca14f65f}"
    }
  }
}