When I first install an extension, there is an option to pin that extension icon to the Firefox taskbar. But if I later unpin it, then I can never repin it back to the taskbar. In older editions of Firefox, long ago, there were ships wheel icons next to the extensions in the extension list. There was choice to "pin to the taskbar", but now there are no ship's wheel icons in the list. And therefore no way to repin the extension to the taskbar. Therefore, once I unpin an extension icon from the taskbar, I have no way to pin it back up there.