Enter about:config into your Firefox address bar Click the I'll be careful button Find xpinstall.signatures.required in the list Right click the preference Select Toggle until the value is false

Make sure the add-on is activated.

Type about:customizing<Enter> in the address bar. In the new window, look for the icon. When you find it, hold down the left button on it, and move it to where you want it to be. You can move any of the icons you want from here, but some icons are locked in place.

Thanks for the reply. I toggled "xpinstall.signatures.required" to false, restarted Firefox and the icon is not visible when in customize.

T. Howard

Does the extension show as installed and enabled on the about:addons page?

Open the Customize window and set which toolbar items to display.

• "3-bar" menu button > Customize

• if missing items are in the Customize palette then drag them back from the Customize window on the toolbar
• if you do not see an item on a toolbar and in the Customize palette then click the Restore Defaults button to restore the default toolbar setup

Try to reset this pref on the about:config page via the right-click context menu to the default value.

• browser.uiCustomization.state

Close and restart Firefox to make the change effective.

https://addons.mozilla.org/en-US/firefox/addon/self-destructing-cookies/

There are reports here of trouble. Check with it's support site.

The Add-on shows to be installed and enabled on the about:addons page

I did reset "browser.uiCustomization.state"

Now, I see "Self-Destructing Cookies" in "Additional Tools and Features" of the "Customize" window but there is no icon to go with the text. I attempt to drag the text to the toolbar and the other icons do not shift as though I am not really dragging an icon.

After closing the Customize window, the SDC Icon is not displayed.

You can open the Browser Console (Firefox menu button or Tools > Web Developer) after starting Firefox and check for error messages about this extension.

• https://developer.mozilla.org/Tools/Browser_Console

I was using the Firefox default theme. I installed another theme and now I have the SDC icon. Thanks for all the suggestions.

T. Howard

Contact their support and tell them about it.