I use the Google search box in Mozilla a lot. I press the keyboard shortcut control+k, type in my search terms, hit Enter, and BAM! Most of the time my search terms are longer than the text box can show, so I found this cool little tweak to make the search box bigger.

To change the default size of the Google search box in Mozilla Firefox, follow these steps:

1. Navigate to C:\Documents and Settings\your_profile_name\Application Data\Phoenix\Profiles\default\xxxxxxxx.slt\chrome
2. Assuming you have not already done so, rename userChrome-example.css to userChrome.css.
3. Add the following lines to the end of the file:
   /* Make the Search box flex wider */
   #search-container {
      -moz-box-flex: 400 !important;
   }
4. Tweak the 400 number to suit.

There are tons more tips like this here. Another one of my favorites, “change the cursor for links that open in a new window (to a crosshair).” Yeah!