I've just started using Firefox under Linux, though I was familiar with it under Windows. Under Windows, when I click anywhere in Firefox's web address window at the top of the screen, the whole previous contents of the screen are immediately highlighted, which suits me, as I can just start typing a new address. Under Linux, however, Firefox behaves differently; it just places a bar cursor wherever I click in the previous address, without highlighting.
How can I get Firefox to highlight in the second setup?