RE: changing tabbar font color...

[Drew Adams]

> I have tabbar, but the gray on gray colors are a little hard to see,
> so I wanted to customise the font color... I got some example code
> from google to start out from, but it generates this error:
> 
> error: Invalid face, tabbar-default-face

Perhaps it depends on your version of tabbar.el.

FWIW, I just customize tabbar faces using M-x customize-face.
This is the relevant part of my custom-file:

'(tabbar-unselected-face
  ((t (:inherit tabbar-default-face
       :box (:line-width 1 :color "white"
             :style pressed-button)))))

If you do this interactively, starting with emacs -Q, what happens?

emacs -Q
M-: (add-to-list 'load-path <directory for tabbar.el>)
M-x load-library RET tabbar
M-x customize-face RET tabbar-default-face

If your version of tabbar.el has `tabbar-default-face' then that should work.
You should be able to customize it and save your changes.

> The relevant section of my .emacs looks like this:
> 
> (require 'tabbar)
> (tabbar-mode)
> (global-set-key [(s-right)] 'tabbar-forward)
> (global-set-key [(s-left)] 'tabbar-backward)
> (set-face-attribute
>  'tabbar-default-face nil :background "gray60")
...