Examine source code of Offline Caching

{
  "author": "OctoSpacc",
  "name": "Offline Caching",
  "description": "Enable offline caching on any web site or app, allowing for usage even without Internet access.",
  "version": "1.0.1",
  "icons": {
    "32": "icons/small-32.png",
    "48": "icons/small-48.png",
    "64": "icons/small-64.png",
    "96": "icons/small-96.png",
    "128": "icons/large-128.png",
    "192": "icons/large-192.png",
    "512": "icons/large-512.png"
  },
  "manifest_version": 2,
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "webRequestFilterResponse.serviceWorkerScript",
    "storage",
    "unlimitedStorage",
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "shared.js",
      "injected-sw.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ef5dce04-f64f-4de1-8cb8-7c0f02bed7e4}"
    }
  }
}