Examine source code of Cache It Out

{
  "manifest_version": 2,
  "name": "Cache It Out",
  "version": "1.1resigned1",
  "description": "Circumvents the browser cache.",
  "icons": {
    "128": "icon_128.png"
  },
  "background": {
    "persistent": true,
    "scripts": [
      "main.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "storage"
  ],
  "browser_action": {
    "default_title": "Cache It Out (on)",
    "default_icon": "icon_19.png"
  },
  "applications": {
    "gecko": {
      "strict_min_version": "57.0a1",
      "id": "{5e2b115e-6663-4e53-be4f-6dfc017046c0}"
    }
  }
}