Twitter color change, twitter recenlty(Feb 4, 2014) brought in a color and design change which has been annoying! So if you want the old-nav-bar-ish look just run the code in your browser after your page is loaded.

FixTwitterColors.js

$('.global-nav .container').css({"max-width": "900px"});
$('.global-nav-inner').css({"background": "#3d3d3d"});
$('.nav > li > a, .nav > li > button').css({ "color": "rgb(187, 187, 187)"});

/* If you are not sure how to run this code, copy the three lines above and
    - if you are on firefox

      -- press control + shift +k 
        --- paste code and press enter
        --- Voilà!

      -- or you can press shift + f4
        --- paste code in scratchpad
        --- press control + r


    - if you are on chrome
    
      -- press control + shift + j
        --- paste code and press enter
        --- Voilà!

 If you want smaller tweet sent pop-up run the code below.

*/

$('#message-drawer .message').css({ "background": "none repeat scroll 0% 0% rgb(255, 255, 255)", "padding": "6px" });

/* Below code decreases the font-size of stats on twitter making them less creeepy. */

$('.stats a strong').css({"font-size":"14px"});

I wrapped it up into firefox addon https://addons.mozilla.org/en-US/firefox/addon/oldtwitter/ and chrome addon https://github.com/pahnin/chrome-oldTwitter