Firefox 109 comes with the new Extensions button as the new way to manage your extensions. You can click the gear icon next to an extension or use the right-click context menu to pin the extension to the toolbar (Pin to Toolbar). To (re)move the extension from the toolbar back to the Extensions button drop-down, you can use "Unpin from Toolbar" in the right-click context menu. --- The regular overflow area (>>) can only be used for built-in Firefox toolbar buttons as shown in the Customize palette and can no longer be used for extensions. For buttons provided by extensions, the Extensions button drop-down serves as overflow area ("Pin to Toolbar" and "Unpin from Toolbar"). Later this year extensions will move their manifest from Manifest V2 to Manifest V3. With MV3 you have more control on what pages the extension is active (enabled) and you need to allow the MV3 extension for each origin. The new Extensions button provides the UI to manage those permissions and enable the extension and without this button MV3 extensions will be dead (disabled) on all webpages. A way to sort items in its drop-down is to pin all items to the toolbar and then unpin each of them in reverse order, each item you unpin is added at the top, so the last item you unpin becomes the first in the list. ---- More info: *https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars *https://blog.mozilla.org/addons/2022/11/17/unified-extensions-button-and-how-to-handle-permissions-in-manifest-v3/