Base64 URL Decoder & Opener is a Chrome extension developed by dvnchrmdev. This free extension falls under the Browsers category, specifically the Add-ons & Tools subcategory.

The main purpose of this extension is to decode base64 encoded URLs, even if they have been encoded twice, and open them in a new tab on the right side. It is a simple and niche tool that focuses solely on this specific functionality, without any additional features.

To use the extension, simply select a base64 encoded URL and right-click to bring up the context menu. You will find two options: "Decode Once" and "Decode Twice". Choose the appropriate option based on the number of times the URL has been encoded, and the extension will decode it and open it in a new tab on the right side, all in the background.

Please note that this extension is designed for a specific use case, and may not be necessary for most users.