Examine source code of CSES Problem Set Filter

{
  "name": "CSES Problem Set Filter",
  "version": "0.1.1",
  "description": "Filter problem list on cses.fi based on topics, and personal status",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "*://cses.fi/*"
  ],
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "*://cses.fi/problemset*"
      ],
      "js": [
        "src/contents/selectBox.js",
        "src/contents/filter.js"
      ],
      "css": [
        "src/contents/style.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "manifest_version": 2
}