Firefox without this add-on is useless to me, so after the Quantum update this add-on made me say goodbye to firefox. I'm on Pale Moon now. Speed start makes it so easy to keep my thousands of bookmarks organised in folders. I especially love the visual presentation of the bookmarks. I often don't remember the URL of a site, but usually I do remember what it looked like, so the thumbnails work like magic for me. Easy to drag and drop the bookmarks, resize them, refresh the thumbnails and favicons. Great add-on, I love it!