Examine source code of Close Other Tabs: Ctrl+Space

{
  "manifest_version": 2,
  "name": "Close Other Tabs: Ctrl+Space",
  "short_name": "Close Other Tabs",
  "version": "1.0.2",
  "description": "Keep your current tab and close the rest in the same Firefox window with Ctrl+Space.",
  "author": "Close Other Tabs Contributors",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@close-other-tabs-ctrl-space",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "close-other-tabs": {
      "suggested_key": {
        "default": "Ctrl+Space",
        "mac": "MacCtrl+Space"
      },
      "description": "Close every tab except the current one"
    }
  }
}