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I don’t mind it, but I know that many users feel annoyed that in version 3, the “Back”-button in Firefox is large and round, as opposed to the same size as the “Forward”-button. Here’s what it looks like:
Luckily for my users, this is easily rectified. Simply right-click any of the buttons close to it, click “Customize”, and then select the checkbox for “Use small icons” like so:
The result looks like this: