I think the best place is the user reviews at the bottom of each add-on page on official add-ons download website Link: [https://addons.mozilla.org/firefox/] Search for the word ''podcast'' [https://addons.mozilla.org/firefox/search/?q=podcast&platform=windows&appver=39.0&sort=users here] Example of review for ''Youtube MP3 Podcaster'' [https://addons.mozilla.org/en-US/firefox/addon/youtube-mp3-podcaster/#reviews here]