If you use extensions with Mozilla Firefox and want to add or remove some extension icons from the toolbar, you can do so using Mozilla Customize Firefox. Or you can quickly remove an icon with a right click. See below how you can do it.
First, open "Firefox". In any window, turn right click in the Firefox toobar and select “Customize”. (Alternatively, you can click on menu and select "Customize" from the menu shows up.)
In the "Customize Firefox" tab that opens, you will see a list of items that can be transferred to the toolbar. You can also drag data from the toolbar to this list, removing them from the toolbar.
If you want to remove one extension icon from the toolbar, click and drag it to region of the list.
If you want to add an extension icon to the toolbar, locate the icon in the list area and drag it to the toolbar.
When you are satisfied with the layout of the toolbar, click "Done," and the "Customize Firefox" tab will close. The changes you will stored.
How to quickly remove an extension icon from the Firefox toolbar
To quickly remove an extension from the toolbar in Firefox, right-click the extension icon on the toolbar and select "Remove from Toolbar".
The toolbar icon will disappear. If you want to reset, you need to right-click on the toolbar, select "Customize", and then drag the extension icon from the list to your toolbar.
Source: howtogeek.com
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