Simple Calculator (+ / X -)

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Simple Calculator (+ / X -)",
  "version": "0.0.1",
  "description": "Do you want calculate your some numerical things..? So use this. You can do (+ / X -) calculation using this. So use this extention.",
  "action": {
    "default_popup": "calculator.html",
    "default_title": "Simple Calculator (+ / X -)",
    "default_icon": {
      "16": "./images/calculator_16x16.png",
      "48": "./images/calculator_1_48x48.png",
      "128": "./images/calculator_2_128x128.png"
    }
  },
  "icons": {
    "16": "./images/calculator_16x16.png",
    "48": "./images/calculator_1_48x48.png",
    "128": "./images/calculator_2_128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main.js"
      ],
      "css": [
        "main.css"
      ]
    }
  ]
}