I decided to edit the browser window of IV's in-game internet.
I am probably sure this is the first ever internet BROWSING WINDOW mod, but I am probably just 1 out of more than 10 (maybe more), so I would like to introduce to you:
the GTA IV Internet Explorer mod!

Please Note: The Mail Icon I was unable to change because I could not find a large enough mail icon, the ones that were too small would glitch or crash the game, so I left it the same;(In respect of Apple/Mac).

I don't have a full screenshot of it yet, but pics of the bars I've changed.

Installation: Using an extractor such as 7-zip, winzip, winrar, etc. Extract the following file(s) to your GTA IV Directory. Example (Most commonly used): C:\Program Files\Rockstar Games\Grand theft auto IV\pc\Textures

And replace the file: Browser.wdd

Enjoy!