Examine source code of Cache Killer

{
  "manifest_version": 2,
  "name": "Cache Killer",
  "version": "1.3",
  "description": "Automatically disables browser cache for selected domains.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Cache Killer"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6b4d25dc-f67e-44ad-ab37-5c07f93a1079}"
    }
  }
}