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How can I change the fonts used by my FF to BOLD fonts?

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I would like to be able to use the bold fonts with my Firefox versions (released, beta, Nightly) but can't seem to find out how to do that.

I would like to be able to use the bold fonts with my Firefox versions (released, beta, Nightly) but can't seem to find out how to do that.

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You can't bold fonts, but you can increase the fonts size by going to setting option.

>> Click the menu button (three horizontal bars on the top right corner) and choose Options >> Select the Content panel >> Under 'Fonts & Colors' section, choose the size you wish to set, default is 16, you can set larger number to make it feel like bold effect.

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Do you have a font installed that looks bolder?

You can use the NoSquint extension to set font size (text/page zoom) and text color on web pages.