A Firebug’s configuration needs to be modified in case you don’t want to use a default setting. Firebug is a add-on in the Mozilla Firefox that can be used to edit HTML, CSS and JavaScript.

1. First download the Firebug extension for Mozilla Firefox and install it. Then enable Firebug extension by going to Tools menu, Add-Ons, Extensions and Enable on the Firebug row.

2. Next enter about:config in the address bar of the Firefox and press Enter key to change the Firebug configuration settings. Find out the lines starting with extensions.firebug and descriptions for the setting are on Firebug website.

3. Right-click on the Firebug lines and select Modify to change the configuration settings. Click on Firebug icon in the Firefox to changes a subset of Firebug configuration settings. Select Firebug Options icon in new Firebug window and go to Text Size and Options to modify settings.

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