Examine source code of Strims Image Paste

{
  "manifest_version": 2,
  "name": "Strims Image Paste",
  "version": "0.1.1",
  "description": "Upload pasted clipboard images to st.pepog.com and insert the returned URL into Strims chat.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "https://st.pepog.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://chat.strims.gg/*",
        "https://strims.gg/*",
        "https://www.strims.gg/*",
        "http://localhost/*",
        "https://localhost/*",
        "http://127.0.0.1/*",
        "https://127.0.0.1/*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "pepog-image-paste-firefox@chat-gui.local"
    }
  }
}