https://downloads.yahoo.com/faqfirefoxtoolbar

On August 1, 2016 we will simplify the Firefox Yahoo Toolbar and upgrade your browser to the New Tab by Yahoo extension experience. This extension provides a static version of Yahoo Toolbar and customizes your new tab page with Flickr photos and quick access to your top sites. Please note, you will no longer be able to modify your toolbar layout.

Yahoo appears to have a simplified version of their toolbar extension at https://addons.mozilla.org/firefox/addon/yahoo-toolbar-and-new-tab/ and their https://toolbar.yahoo.com/ link leads to a more simple page.

Mozilla does not make or maintain any of the Yahoo extensions made by Yahoo. There has not been any Firefox updates since the 47.0.1 to affect any extensions and next update will be Firefox 48.0 tomorrow.

cant add anything to yahoo toolbar to button to click on

To get the pre-August 1 bar back, you could try this:

(1) Instally the July 26th version of the toolbar from the following page:

https://addons.mozilla.org/firefox/addon/yahoo-toolbar-and-new-tab/versions/

Firefox likely will mention restarting to complete the installation. Before restarting Firefox:

(2) Turn off automatic updating for the extension on the Add-ons page. Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Extensions. Then on the right side find the Yahoo toolbar -- I think it will be under one entry and not two entries, but we're in new territory here...

Click the tiny More link under the title Yahoo toolbar, then on that next page, find the row for Automatic Updates and set it to Off.

Then you can use the restart link for the toolbar to complete the installation.

Success?