Examine source code of Tab Suspender Mini

{
  "manifest_version": 2,
  "name": "Tab Suspender Mini",
  "version": "1.51",
  "description": "Suspends inactive tabs after 60 seconds",
  "permissions": [
    "tabs",
    "<all_urls>",
    "activeTab",
    "storage",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "src/background/background.js"
    ],
    "persistent": true
  },
  "commands": {
    "suspend-tab": {
      "suggested_key": {
        "default": "Ctrl+Shift+X",
        "mac": "Command+Shift+X"
      },
      "description": "Suspend the current tab"
    }
  },
  "browser_action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    },
    "default_title": "Tab Suspender Mini"
  },
  "web_accessible_resources": [
    "src/suspended/suspended.html",
    "src/suspended/suspended.js"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b555ee4e-edbd-48f0-94d3-4107b04e7282}"
    }
  }
}