Is it this? http://tools.seobook.com/firefox/seo-for-firefox.html Maybe you need to manually add its icon to your toolbar? Try using the Customize feature to see whether it is among the buttons that are not currently on any bar, and then you can move it to a convenient location. This article has the steps: [[Customize Firefox controls, buttons and toolbars]]. Please note that in Firefox 29 and higher, there is no more Add-on bar at the bottom of the browser. If you want to position a bar there and use it for some of your toolbar buttons, you can use this extension: [https://addons.mozilla.org/firefox/addon/the-addon-bar/ The Addon Bar (Restored)]. Success? If the button doesn't function as expected, you may need to check with the publisher. Since you need an account to get the extension, I suspect that most volunteers will not be familiar with it...