Palettes for Tumblr 
A colour scheme manager for Tumblr!
Features
- 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
Screenshots
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Installation
Usage
Once you've installed the addon, click the addon icon in the browser toolbar to open its configuration. The addon can be configured from any page, but will only affect www.tumblr.com.
This addon 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.
Change Palette
This dropdown allows you to override Tumblr's colour scheme. You can choose a palette provided by Tumblr, a palette provided by the addon, or any custom palettes you've defined.
Manage...
Click this button to open the palette manager. You can create and edit custom palettes on this page.
Change Font
This dropdown allows you to override Tumblr's font type. You can choose to keep the default font (Favorit), switch back to Tumblr's old default font (Helvetica Neue), or select a system font.
Change Base Font Size
This dropdown lets you set the base font size that Tumblr uses. This affects the size of all text on the page, essentially allowing you to zoom in or out without affecting the size of Tumblr's layout elements.