Available for Firefox. It is lightweight and adds a simple drop-down menu to the YouTube page for quick audio rips. 2. Desktop Software (The Reliable Choice)

Most YouTube audio is streamed at 126kbps (AAC) or 160kbps (Opus). While some plugins offer "320kbps MP3," they are often just "upscaling" the lower-quality stream, which doesn't actually improve the sound—it just makes the file larger.

These are classic choices. You paste the URL, click convert, and download the file.