Firefox 109 comes with the Extensions button as the new way to manage your extensions. The Extensions button (puzzle piece icon) drop-down serves as overflow area for extensions you install, the legacy chevron (>>) overflow area still exists but is only used for built-in toolbar buttons as found in the Customize palette. 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.

More Information:

• https://support.mozilla.org/en-US/kb/extensions-button

Thanks for reply Cor-el, I let you know later how i got on with add-on extension Pin to Toolbar as i have a personal problem to sort out first. Will add some screen shots of what i see on pc.

I have sorted problem ...i forgot i had profile folder of firefox from previous pc on usb and copied the contents of this folder and pasted the contents into firefox on new pc...everything works ok now.