Really like the sidebar implementation. That said, it obviously changes how you interact with FF. With my two day testing I have a request.
I have several extensions that add their own sidebars. They also sometimes add icons to the address bar and to the toolbar (and often via a right-click menu). Several provide 3 or more different ways to access them in the main FF UI. There is only the overflow menu as a mechanism to choose the presentation of one - all others are not optional.
This isn't anything new other than Vertical sidebars are now visible and accessed all the time. I want the ability to decide what is on the sidebar just like I can decide which extensions are on the toolbar. You can literally have sidebars that open sidebars that open sidebars. (try enabling the sidebar. Now right-click on the customize sidebar. Now launch a sidebar extension. I have one extension that then provides launching *another* sidebar. Some extensions make sense next to the addressbar - some in the sidebar.
In the sidebar "Customize sidebar" sidebar (whew!) can we please have the ability to have a sidebar overflow menu like the toolbar? Or the ability to hide extension sidebar icons from the main sidebar list? Or best would be the ability to disable sidebar integration by extension.
The simplest way seems: I always have the ability to open sidebar extensions via the customize sidebar sidebar. Just add a checkbox next to the individual extensions so I can choose their presentation exactly the same way I can with the Firefox native ones "AI chatbot, History, Bookmarks...etc"