Rated 1 out of 5 stars

I downloaded it and restarted as instructed. No buttons on toolbars or anywhere else on the page. Where are the zoom buttons????

This review is for a previous version of the add-on (1.1.5.1-signed). 

Please add them...

There are different buttons providing different ways of zooming.
You choose the one(s) that you want and add them to the toolbar of your choice.
Open the Customize Toolbar window:
Right click on a toolbar > Customize
or
If the Firefox Menu Bar -is- showing, go to View > Toolbars > Customize
If the Firefox Menu Bar -is not- showing, click on the Firefox button (top left of your browser), Options > Toolbar Layout.

Drag the Zoom button(s) of your choice to a toolbar of your choice.
A description of what each button does can be found at the following address.
http://www.accessfirefox.org//Extensions_SS/Page_Zoom_Buttons/version/1.1.5/index.php

Please consider re-reviewing and rating Page Zoom Buttons after you have tried the info that I have provided.

Thank you
Ken