How to change active tab color in Sublime Text 3

As many others have already noticed - Sublime Text editor color scheme for an active tab is not optimal. In case of many tabs are open - it's really difficult to recognize the selected one:
So, below is step by step guide how to change that (I used default theme):

1) Find Default.sublime-theme configuration file in packages folder (\Data\Packages\Theme - Default) and open it in edit mode.

2) Add the following string
{"class": "tab_control", "attributes": ["selected", "file_medium_dark"],"tint_modifier": [255, 255, 255, 80]}, and save changes

3) Enjoy changes :-)

P.S. Kudos to Erik van Nieuwburg for providing info regarding Sublime Text 2