Image zoom in Google Sheets

manifest.json

{
  "manifest_version": 2,
  "name": "Image zoom in Google Sheets",
  "version": "1.0",
  "description": "Allows to zoom on images in Google Sheets",
  "content_scripts": [
    {
      "matches": [
        "*://docs.google.com/spreadsheets/*"
      ],
      "js": [
        "extension.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1b23f8e0-94c0-416d-8b82-7b32cb65eab5}"
    }
  }
}