Toolbar support in Firefox is limited to horizontal toolbars. You could argue that the sidebar available in the Firefox browser is more or less a vertical toolbar, but since it is not as customizable as other toolbars in the browser, I would not necessarily count it as that.
If you have ever tried a recent version of the Opera web browser, you know that it can display a toolbar on the left side of the web browser window that leads to popular browser features. This is called panels in Opera, and it takes a single click to display or hide the icons provided in the interface. Firefox users can now add a vertical toolbar to their browser as well, thanks to a new Firefox add-on.
Enter Vertical Toolbar, a Mozilla Firefox add-on that adds a toolbar to the left or right side of the browser. Vertical buttons in Firefox can be beneficial for widescreen users who usually have a lot of white space on either side of the Internet browser window, and especially so if their horizontal space is rather limited and they prefer not to display a horizontal toolbar in the browser.
When you install the extension in the browser you will immediately see the new Firefox toolbar attached to the left side of the browser window on restart. The developers have added six buttons to it by default which lead to the browser history, download manager, the bookmarks, and printing, fullscreen and reloading options.
Like any other toolbar in the browser, it can be customized with new icons that you can drag and drop onto it. Right-click on the toolbar and select customize from the context menu.
Additional icons have been added to the list of available ones by the Firefox add-on. This includes links to consoles, private browsing, the page source or page info, among other new toolbar buttons. A simple drag and drop moves any of the icons from the customize toolbar window to the vertical toolbar, and vice versa. You can also drag and drop other interface elements, for instance from Firefox's status bar or navigational toolbar, to the new bar.
You can also select options from the right-click context menu to customize the Firefox add-on further.
Here you can select to place the toolbar on the right-side instead of the left, enable auto-hide or change the toolbar buttons display from icons only to text, or icons and text.
Vertical Toolbar can be a handy Firefox add-on for users who prefer to use a vertical bar in the browser.
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