tpaksu

This plugin uses CSS technique to fix the png image transparency issue and jQuery to apply this script to all of png images shown in the page. 
This doesn’t work for positioned and tiled png background images. Maybe in next versions.

WP pngfix

Plugin that fixes the png image transparency issue on IE.

shawfactor

By default wordpress will use a resized version of your site icon as a favicon. This is not ideal as you may want a different icons, an svg favicon, or different transparency for your favicon. Thiss plugin solve this problem.

LH Favicon

Overide your site icon favicon on the front end of your site

WP pngfix vs LH Favicon