Palettes for Tumblr for Chrome
More About Palettes for Tumblr
• Create your own palette, or choose from the built-in options
• Change the page font independently of your chosen palette
• Adjust the base font size
Once you've installed the extension, click the extension icon in the browser toolbar to open its configuration.
This extension only affects pages updated to use Tumblr's new web interface. This means Tumblr pages that do not usually offer the "Change Palette" button will not be affected.