- Click the extensions button (jigsaw puzzle icon) in the toolbar to open the extensions panel. - Each extension in the panel has a menu button with a gear icon. - You can use this menu button to manage those extensions.

Pin to Toolbar: pins the extension to the Firefox toolbar

Can't find the "Pin to Toolbar:" setting anywhere in the Mozilla settings...

Can't find the "Pin to Toolbar:" setting anywhere in the Mozilla settings either! Why has it always been so difficult to do? It seems impossible now! There's no way I can remember all the 'shortcut' key strokes!

Hello

Manage your extensions using the extensions button in the toolbar. https://support.mozilla.org/en-US/kb/extensions-button

Pin to Toolbar: pins the extension to the Firefox toolbar (this option may not be available for certain extensions, such as search engine add-ons).

This option may not be available for certain extensions, is it this subject.

Or

Is it this subject, Accidentally removed extensions button. https://support.mozilla.org/en-US/questions/1528226