I found that after installing the Verizon driver, Android File Transfer would not open anymore.
To fix this issue, you have to manually delete the driver called ssuddrv.kext. It lives in:
It lives in /System/Library/Extensions/ssuddrv.kext
launch terminal and execute:
sudo rm -rf /System/Library/Extensions/ssuddrv.kext
Reboot your Mac and you should be able to use Android File Transfer again.