Are there any specific plugins or browser extensions that you recommend to easily convert YouTube to MP3?

I don't use plugins, moreover I don't even know what they are or how to use them. Instead I use this site https://ytmp3.lc . It doesn't take more than a minute to get an mp3 file here and that's why I like this site. But if you can tell me about alternatives, I would appreciate it. I would like to compare what would be more convenient and cost-effective to use.