Examine source code of Fire Clear Cache

{
  "description": "Fire Clear Cache",
  "manifest_version": 2,
  "name": "Fire Clear Cache",
  "version": "0.9.0",
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "background": {
    "scripts": [
      "lib/jquery-3.5.1.js",
      "lib/signals.js",
      "lib/icon-animation.js",
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "@fireclearcache",
      "strict_min_version": "57.0"
    }
  },
  "browser_action": {
    "default_icon": {
      "19": "img/icon_19.png",
      "38": "img/icon_38.png"
    },
    "default_title": "Clear Cache"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "browsingData",
    "storage",
    "tabs",
    "cookies"
  ]
}