I’m a user of a particular premium service with a Firefox add-on. One of the features of this add-on was (until very recently) that it presented itself as a sidebar (docked to the left while leaving your browsing experience unobstructed to the right). With the newest version of the add-on the company has made a lot of angry customers by removing this sidebar in favor of a typical button with dropdown panel.
The reason I’m here is that they’ve cited changes to the add-on SDK as the reason they can’t do a sidebar anymore (“Sidebar plugins are not possible any more using the latest SDK”). I’m just wondering if this is truly the case. Did something change in a new version that removes support for this kind of sidebar/docking?