How to not select all text automatically in Address Bar when I toggle tabs

When I open a new Tab and I write in Address Bar and I change to another tab and I return, Firefox select all text automatically of Address Bar. I don't want this, because I am typing in Address Bar, so I need consult a information in another tab. I go to another tab, and when come back, I want to continue writing, but Firefox automatically selects all text, and delete accidentally it. This doesn't happen in Google Chrome. I think this is possible to change it in "about:config", but how?

Thanks in advance.