This is the closest I've come to using an extension that provides what I liked about Panorama. I like being able to sort and create new categories in the sidebar but for whatever reason when I use this extension from time to time pages will no longer load. I'll see the loading animation on the tab but nothing appears. When I turn this extension off then the page loads normally. It's frustrating and it's the one problem I have with this extension. Even when I clear the browser cache and history then quit and reopen Firefox it still happens.