How to Make a Chrome Extension?
Expert Guide from A to Z 2026

Learn how to develop modern, secure and high-performance Chrome extensions using Manifest V3 standards. With this comprehensive guide, you will be able to code your own extension from scratch and publish it on the Chrome Web Store.

What is a Chrome Extension and Why Should You Develop It?

Chrome extensions are small software programs written with web technologies such as HTML, CSS and JavaScript that extend the functionality of the Google Chrome browser. 2026 With the increase in browser-based workflows, custom plug-ins have become indispensable for both individual productivity and corporate solutions.

As Eka Sunucu, providing integration in your web-based projects, e-commerce processes We believe in the power of developing plugins to automate or simply improve user experience.

Important Information: Manifest V3

Google has completely discontinued support for Manifest V2 as of 2024 . All plugins you will develop for 2026 and later will be security and performance focused. Manifest V3 must comply with the standards. This guide is fully V3 compatible.

Web Technologies

You can develop powerful applications just by knowing HTML, CSS and JS.

High Security

Working safely with isolated environments and strict leave policies.

Easy Deployment

Instant access to millions of users via the Chrome Web Store.

Step 1: Projectctct Structure and Manifest File

At the heart of every Chrome extension manifest.json file is available. This file tells the browser your plugin's name, version, permissions, and which files to use.

First on your computer my-awesome-extension Create a folder called and add the following files into it:

Creating manifest.json

In the root directory of the folder manifest.json Create the file and add the following codes:

{
  "manifest_version": 3,
  "name": "Eka Sunucu SEO Analysis",
  "version": "1.0",
  "description": "Professional tool that performs basic SEO analysis of web pages.",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png"
    }
  },
  "permissions": ["activeTab", "scripting"],
  "host_permissions": [
    "https://*.ekasunucu.com/*"
  ]
}
          

Step 2: Interface and Logic Coding

The window (popup) that will open when the plugin icon is clicked is a standard HTML page. Here you can use modern CSS frameworks or your own styles.

popup.html (Interface)

Let's design a simple interface that the user will interact with.

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <div class="container">
    <h3>SEO Analyzer</h3>
    <button id="analyzeBtn">Analyze Page</button>
    <div id="result"></div>
  </div>
  <script src="popup.js"></script>
</body>
</html>
          

popup.js (Logic)

Let's get the page title and meta description by injecting a script that runs in the active tab when the button is clicked.

document.getElementById("analyzeBtn").addEventListener("click", async () => {
  let [tab] = await chrome.tabs.query({ active: true, currentWindow: true });

  chrome.scripting.executeScript({
    target: { tabId: tab.id },
    function: getPageSEO,
  }, (results) => {    const data = results[0].result;
    document.getElementById("result").innerHTML =      `<p><b>Title:</b> ${data.title}</p>` +
      `<p><b>Description:</b> ${data.description}</p>`;
  });
});

function getPageSEO() {
  const title= document.title;  const metaDesc = document.querySelector('meta[name="description"]');
  return {
    title: title,
    description: metaDesc ? metaDesc.content : "Not Found"
  };
}
          

Backend API and Database Integration

Advanced plugins often process or save data on a server. For example, if you are making a plugin where users save their favorite products, you need a secure API.

As Eka Sunucu, we provide high-performance servers to manage the background of your plugins. web hosting and VPS We offer solutions. An API you write in PHP or Python can be the brain of your plugin.

<?php
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json");

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $data = json_decode(file_get_contents("php://input"));

    // Database operations are done here...
    $response = ['status' => 'success', 'message' => 'Data saved'];

    echo json_encode($response);
}
?>
        

For the security of your data on the backend side, SSL Certificate you should use Google may mark non-HTTPS links as unsafe in plugins.

Publishing to Chrome Web Store

Once your plugin is ready, it's time to share it with the world. Here's the step-by-step publishing process:

Packaging: Create your plugin folder .zip Make it a file.
Developer Account: Chrome Web Store Developer DashboardGo to . For the first registration you must pay a one-time fee of 5$.
Installation: Click the "Add new item" button and upload your zip file.
Store Information: Fill in the description, screenshots (1280x800px recommended) and category information.
Privacy Policy: If you collect user data, you must include a privacy policy link hosted on your website.
Review: Press the "Submit for review" button. The Google team typically completes the review within 24-48 hours.

2026 Plugin SEO and Marketing Trends

In order for your plugin to be found in the store, you must pay attention to 2026 SEO criteria. Now, not only keywords, but user experience and authority are at the forefront.

E-E-A-T (Experience, Expertise, Authority, Trust): Show that there is a reliable developer or company behind your plugin. A corporate website and a verified domain increases this trust.
Core Web Vitals: Your plugin should not slow down the browser. Use background processes (Service Workers) efficiently.
Multi-Language Support: Expand into the global market by translating your plugin into different languages.
Rich Media: Use short videos showing how the plugin works on your store page, not just images.

Do You Need a Professional Plugin?

Do you have an idea but no coding knowledge? As Eka Sunucu software team, we develop Chrome, Firefox and Edge plug-ins specific to your company.

Prices Starting From 15.000 ₺ Get a Quote

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How to Make a Chrome Extension?
Expert Guide from A to Z 2026

What is a Chrome Extension and Why Should You Develop It?

Important Information: Manifest V3

Web Technologies

High Security

Easy Deployment

Step 1: Projectctct Structure and Manifest File

Creating manifest.json

Step 2: Interface and Logic Coding

popup.html (Interface)

popup.js (Logic)

Backend API and Database Integration

Publishing to Chrome Web Store

2026 Plugin SEO and Marketing Trends

Do You Need a Professional Plugin?

Frequently Asked Questions

What languages should I know to develop plugins?

Is Manifest V2 still available?

How can I make money from my plugin?

Where should my plugin store data?

Call now to get more detailed information about our products and services.

Custom Server Services

Standard Servers

Custom Server Services

Standard Servers

Contact Us

How to Make a Chrome Extension? Expert Guide from A to Z 2026

What is a Chrome Extension and Why Should You Develop It?

Important Information: Manifest V3

Web Technologies

High Security

Easy Deployment

Step 1: Projectctct Structure and Manifest File

Creating manifest.json

Step 2: Interface and Logic Coding

popup.html (Interface)

popup.js (Logic)

Backend API and Database Integration

Publishing to Chrome Web Store

2026 Plugin SEO and Marketing Trends

Do You Need a Professional Plugin?

Frequently Asked Questions

What languages should I know to develop plugins?

Is Manifest V2 still available?

How can I make money from my plugin?

Where should my plugin store data?

Call now to get more detailed information about our products and services.

How to Make a Chrome Extension?
Expert Guide from A to Z 2026