Improve tab contrast

[dreadnaut]

Hello there! I know this theme is been around for a long time, but I was wondering if there is space to improve the colours used for the tab line. With background = dark, the tabs are light and a bit blinding, while with background = light the text is difficult to read.

I would propose this change:

diff --git a/colors/two-firewatch.vim b/colors/two-firewatch.vim
index a5c61a4..fa525fd 100644
--- a/colors/two-firewatch.vim
+++ b/colors/two-firewatch.vim
@@ -331,8 +331,8 @@ if has('gui_running') || &t_Co == 88 || &t_Co == 256
   call <sid>X('SpecialKey',   s:syntax_fold_bg, '',                   '')
   call <sid>X('StatusLine',   s:syntax_fg,      s:syntax_cursor_line, 'none')
   call <sid>X('StatusLineNC', s:uno_4,          '',                   '')
-  call <sid>X('TabLine',      s:uno_4,          '',                   '')
-  call <sid>X('TabLineFill',  '',               '',                   'none')
+  call <sid>X('TabLine',      s:syntax_fg,      s:uno_4,              '')
+  call <sid>X('TabLineFill',  '',               s:uno_4,              'none')
   call <sid>X('TabLineSel',   s:syntax_fg,      '',                   '')
   call <sid>X('Title',        s:duo_2,          '',                   'bold')
   call <sid>X('Visual',       '',               s:syntax_selection,   '')

Before and after