Examine source code of BP Proxy Switcher

{
  "manifest_version": 2,
  "name": "BP Proxy Switcher",
  "description": "Change your proxies with one click",
  "version": "4.0.9",
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "{acfcb698-c152-4251-bf27-38bebc3c269a}"
    }
  },
  "icons": {
    "16": "img/icon.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "permissions": [
    "storage",
    "proxy",
    "privacy",
    "notifications",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "tabs",
    "browsingData",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "incognito": "spanning"
}