Font Highlighting Editor is a Processing tool that acts as a simple visual editor for the environment's font coloring settings.
Install the tool using Processing's contribution manager. (Tools → Add Tool...)
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Download the latest release.
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Navigate to Processing's Sketchbook folder (the location of it is shown in Processing's Preferences dialog: File → Preferences). Inside it, create a folder called "tools", if it doesn't exist already.
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Extract the downloaded archive into the tools folder.
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Restart Processing.