Firefox - (Address bar) Select full URL upon click

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If you want Firefox to automatically select all the text upon clicking on the URL bar (instead of doing CTRL + A, all the time), follow the below procedure:
  • In the address bar type "about-config" and press Enter
  • In the Filter field search for "browser.urlbar.clickSelectsAll"
  • Double click on this entry in order to set the value to "True"
  • Close the about: config window.