First version

README.md

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+<h1 align="center">Welcome to brave-lock-pinned-tabs 👋</h1>
+<p>
+  <img alt="Version" src="https://img.shields.io/badge/version-1.0.0-blue.svg?cacheSeconds=2592000" />
+  <a href="http://www.wtfpl.net/about/" target="_blank">
+    <img alt="License: WTFPL" src="https://img.shields.io/badge/License-WTFPL-yellow.svg" />
+  </a>
+</p>
+
+> Brave extension to prevent pinned tabs from being closed accidentally
+
+## Installation
+
+Clone this repo and [load the extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/#unpacked).
+
+## Usage
+
+1. In your browser open the address `brave://extensions/shortcuts`
+
+2. Look for the extension "Lock Pinned Tabs"
+
+3. In the option `Activate the extension` set the key `Ctrl + w`
+
+4. Now it will replace the default `Ctrl + w` and this extension will prevent pinned tabs from being closed using Ctrl + W.
+
+-------------
+
+
+This extension was inspired on https://github.com/gabrielmaldi/chrome-lock-tab

manifest.json

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+{
+  "name": "Lock Pinned Tabs",
+  "description": "Prevents pinned a tab from being closed accidentally",
+  "version": "1.0.0",
+
+  "author": "gustavotrott",
+  "homepage_url": "https://github.com/gustavotrott/chrome-lock-tab",
+  "manifest_version": 3,
+  "permissions": [
+    "activeTab"
+  ],
+  "icons": {
+    "128": "images/icon_128.png"
+  },
+  "background": {
+    "service_worker": "src/background.js"
+  },
+  "action": {}
+}

src/background.js

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+chrome.action.onClicked.addListener((tab) => {
+  if (!tab.pinned) {
+    chrome.tabs.remove(tab.id);
+  }
+});