Examine source code of Keyspace

{
  "name": "Keyspace",
  "description": "Keyspace wallet browser add-on",
  "version": "1.0.6",
  "manifest_version": 2,
  "icons": {
    "16": "./images/favicon-16x16.png",
    "32": "./images/favicon-32x32.png",
    "192": "./images/favicon-192x192.png",
    "512": "./images/favicon-512x512.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "./images/favicon-16x16.png",
      "32": "./images/favicon-32x32.png",
      "192": "./images/favicon-192x192.png",
      "512": "./images/favicon-512x512.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "unlimitedStorage",
    "clipboardRead",
    "clipboardWrite",
    "http://*/*",
    "https://*/*"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Period"
      },
      "description": "keyboard call"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8918b2ce-40e3-4fc6-86c1-95049594d336}"
    }
  }
}