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How to change font which firefox uses?

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When i hit ctrl+u to show source code of website the window open in courier new font i want to change it because it is not as readable as other fonts,how can i do this?

When i hit ctrl+u to show source code of website the window open in courier new font i want to change it because it is not as readable as other fonts,how can i do this?

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  1. Click either the Firefox button or the Tools menu and choose Options.
  2. In the Options window, click the Content icon.
  3. Click the Advanced button.
  4. Select Fonts for: Western
  5. Set the Monospace font to whatever you want, e.g. Consolas.
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Your post shows how to change font "website" uses i want to change "firefox' own" monospace font page's source code is still courier new(I changed monospace to consolas)

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It applies to the View Source window as well as web pages: see the attached screenshot. Try also modifying the monospace font for Other Languages and User Defined.

If that doesn't help, check if you have the same problem in a new profile.