I am a font controller, and almost all the software I can use is the "Courier New" font. firebug is a Firefox plug-in that I like very much and naturally cannot escape my palm, the reason for modifying it is that it is hard to see during debugging.
This method is widely used on the Internet. After I successfully tested it on an English website, I listed a detailed step and completed it step by step.
1. the firebug font cannot be modified using the about: config method of Firefox.
2. Find the following reference path on your computer (if you have installed Firefox and firebug plug-ins, my environment is win7-64bit, firefox8.0, firebug1.8.4)
C: \ Users \ Administrator \ appdata \ roaming \ Mozilla \ Firefox \ profiles \ tcaacw95.default \ extensions
In the path, "Administrator" is your username path. Here, "Administrator" is used;
In the path, tcaacw95.default may be a random number. You can find your own "random number. Default" folder.
3, there is a firebug@software.joehewitt.com.xpi in the path, he is actually a compressed file, inside the modification part of the CSS style sheet font-family style.
4, use WinRAR to open the firebug@software.joehewitt.com.xpi, modify the font-family font of the following CSS file. I'm a courier new font controller. Of course I modified this font.
\content\firebug\firebug.css Line 26: font-family: "Courier New", monospace; Line 255: font-family:
"Courier New",
monospace;\skin\classic\console.css Line 50: font-family:
"Courier New",
monospace; Line 125: font-family:
"Courier New",
monospace; Line 211: font-family:
"Courier New",
monospace; Line 424: font-family:
"Courier New",
monospace; Line 505: font-family:
"Courier New",
monospace;\skin\classic\css.css Line 14: font-family:
"Courier New",
monospace;\skin\classic\debugger.css Line 5: font-family:
"Courier New",
monospace; Line 16: font-family:
"Courier New",
monospace; Line 50: font-family:
"Courier New",
monospace; Line 157: font-family:
"Courier New",
monospace; Line 301: font-family:
"Courier New",
monospace; Line 310: font-family:
"Courier New",
monospace;\skin\classic\dom.css Line 156: font-family:
"Courier New",
monospace;\skin\classic\firebug.css Line 72: font-family:
"Courier New",
monospace; Line 81: font-family:
"Courier New",
monospace; Line 92: font-family:
"Courier New",
monospace; Line 497: font-family:
"Courier New",
monospace;\skin\classic\html.css Line 11: font-family:
"Courier New",
monospace; Line 76: font-family:
"Courier New",
monospace;\skin\classic\net.css Line 245: font-family:
"Courier New",
monospace; Line 655: font-family:
"Courier New",
monospace;\skin\classic\panelbase.css Line 260: font-family:
"Courier New",
monospace;
\skin\classic\tableRep.css Line 4: font-family:
"Courier New",
monospace;\skin\classic\win\firebug.css Line 151: font-family:
"Courier New",
monospace;
Without a picture
Reprinted from: http://www.oschina.net/question/73027_31934