Examine source code of hideOsu!Rank

{
  "manifest_version": 2,
  "name": "hideOsu!Rank",
  "version": "1.1",
  "description": "hides osu rank section from user profiles",
  "icons": {
    "32": "icons/a32.png",
    "48": "icons/a48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://osu.ppy.sh/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{97b096af-55cc-4756-97c1-2ac38827ef0a}"
    }
  }
}