Hi,

Here's a simple icon viewer that I threw together. This allows you to easily view and search through all icons present in loaded .pbos. Run the script from the debug console. Use the search bar to search for specific icons. Click on an icon to copy the path to your clipboard. Since it uses addonFiles, icons from .ebos cannot be viewed.
 
Script:
https://gist.github.com/HallyG/fa7a6cda10abcb630b1dc325f0523553
Cheers