Examine source code of CPH Submit

{
  "name": "CPH Submit",
  "author": "agrawal-d@outlook.com",
  "homepage_url": "https://github.com/agrawal-d/cph-submit",
  "version": "1.9.0",
  "description": "Codeforces Submit add-on for Competitive Programming Helper.",
  "icons": {
    "48": "icon-48.png"
  },
  "manifest_version": 2,
  "background": {
    "scripts": [
      "dist/backgroundScript.js"
    ]
  },
  "permissions": [
    "scripting",
    "*://localhost/*",
    "https://cses.fi/*",
    "*://codeforces.com/*",
    "*://maang.in/*",
    "webNavigation"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5dd8fd6e-0733-41a7-abc4-e19fba703de9}",
      "strict_min_version": "58.0"
    }
  }
}