Examine source code of rrefresh

{
  "name": "rrefresh",
  "version": "1.0.3",
  "description": "rrefresh",
  "permissions": [
    "menus",
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "rrefresh@thefarbeyond.com",
      "strict_min_version": "57.0"
    }
  },
  "browser_action": {
    "default_icon": "icon/rrefresh.png",
    "default_title": "RRefresh",
    "default_popup": "html/rrefresh.html"
  },
  "background": {
    "scripts": [
      "wasm/rrefresh.js",
      "js/util.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "js/rrcontent.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "wasm/rrefresh_bg.wasm"
  ],
  "manifest_version": 2
}