This review does not focus on a single piece of software but rather on the category of Firefox extensions and helper tools that claim to convert YouTube videos to MP3 files directly within the browser.
Because of the restrictions on the official store, the functionality has largely moved to two other methods: firefox mp3 youtube downloader
Several add-ons are currently popular for their ease of use and high-quality output: This review does not focus on a single
I tested 5 popular "MP3 downloader" extensions on Firefox 122. 3 were dead (API keys expired), 1 required a paid subscription after 3 downloads, and 1 downloaded a 64kbps MP3 with audio artifacts (crackling on high hats). firefox mp3 youtube downloader
: Visit the Firefox Add-ons Store and search for "YouTube MP3 downloader".