Examine source code of CacheFlux

{
  "manifest_version": 2,
  "name": "CacheFlux",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "cacheflux@albertolicea.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "One-click cleaner for cookies, localStorage, sessionStorage and IndexedDB for developers.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_title": "Clean Cache and Data"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_page": "options.html",
  "permissions": [
    "activeTab",
    "cookies",
    "storage",
    "contextMenus",
    "<all_urls>"
  ]
}