Increase or decrease browser.urlbar.maxRichResults using about:config

• http://www.mydigitallife.info/change-the-maximum-rich-url-listings-in-firefox-awesome-smart-location-bar/
• http://kb.mozillazine.org/About:config

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Although this should have solved the problem, it didn't. I tried different lengths and even restarted Firefox, the length of the drop down menu is stuck at four (it's always been four and not the three that I stated in my question).

Any other suggestions?

I should have included that only the drop down menu accessed by pressing the arrow on the right edge of the location bar is limited to a length of four. The length of auto suggestion list DOES change after a character for a new URL is entered.

Also, I tried making changes on my laptop and the length of list changes as it should. In contrast, the length does not change on the desktop. Again, the operating systems and Firefox versions are the same on both computers.

This issue can be caused by the FastestFox extension.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode