Examine source code of iShell

{
  "version": "1.1.6.3",
  "applications": {
    "gecko": {
      "id": "ishell-we@gchristensen.github.io",
      "strict_min_version": "95.0"
    }
  },
  "name": "iShell Extension",
  "short_name": "iShell",
  "homepage_url": "https://gchristensen.github.io/#ishell",
  "author": "gchristnsn",
  "description": "A linguistic interface for browsers.",
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';",
  "manifest_version": 2,
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "browser_action": {
    "default_title": "iShell",
    "default_popup": "/ui/popup.html",
    "default_icon": "/ui/icons/logo.svg"
  },
  "options_ui": {
    "page": "ui/options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "chromeos": "Ctrl+Space",
        "linux": "Ctrl+Space",
        "mac": "Command+Space",
        "windows": "Ctrl+Space"
      }
    }
  },
  "icons": {
    "128": "/ui/icons/logo.svg"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "tabHide",
    "clipboardRead",
    "clipboardWrite",
    "notifications",
    "nativeMessaging",
    "storage",
    "unlimitedStorage",
    "contextMenus",
    "history",
    "webNavigation",
    "management",
    "downloads",
    "sessions",
    "contextualIdentities",
    "cookies",
    "webRequest",
    "webRequestBlocking",
    "browsingData",
    "search"
  ]
}