Configure Firefox in Ubuntu to Highlight Entry in the Address or Search Bar in Single Click

Ubuntu's Firefox default setting is just annoying: A single click in Firefox address or search bar does not highlight the entry.

Here are the steps to configure Firefox to highlight the entry in the address or search bar.

1. In Firefox address bar, type about:config and press Enter.
2. Click the “I'll be careful, I promise!” button.
3. In the Filter box type browser.urlbar.clickSelectsAll.
   
4. Under Preference Name, double-click browser.urlbar.clickSelectsAll to set it to “true” (or right click and select toggle).
5. Close about:config.
   

Note: If the address or search bar does not highlight on single click, restart Firefox.