Hotkeys to Switch Tabs Left and Right

manifest.json

{
  "manifest_version": 2,
  "name": "Hotkeys to Switch Tabs Left and Right",
  "description": "In case you need more keyboard shortcuts to change tabs.",
  "version": "0.5",
  "applications": {
    "gecko": {
      "id": "[email protected]",
      "strict_min_version": "60.0"
    }
  },
  "developer": {
    "name": "Jefferson \"jscher2000\" Scher",
    "url": "https://github.com/jscher2000/"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "left-tab-right-tab.png"
  },
  "commands": {
    "left-tab": {
      "suggested_key": {
        "default": "Ctrl+Alt+Left"
      },
      "description": "Switch to tab to the left"
    },
    "right-tab": {
      "suggested_key": {
        "default": "Ctrl+Alt+Right"
      },
      "description": "Switch to tab to the right"
    }
  }
}