A workround is:
- go to folder 
.thunderbird/YOURTHUNDERBIRDPROFILE.default/extensions/{YOUR_UUID_FIRETRAY_PROFILE}/chrome/skin/icons/linux/hicolor/22x22/apps
- delete the png images of installed mozilla products
- restart Thunderbird

Verified on ubuntu 16.04 LTS + Thunderbird 52.1.1 (64 bit) + FireTray
0.6.1 .

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https://bugs.launchpad.net/bugs/1531345

Title:
  Thunderbird/Firefox icon blurry in unity launcher and in alt+tab
  interface

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