Overview
What is Thunderbird Biff?
Thunderbird Biff provides a visual indicator of new Thunderbird mail availability in both Firefox and Thunderbird
In depth
A closer look at Thunderbird Biff
Having recently switched from the Mozilla Suite to Firefox/Thunderbird, I was sorry to loose some aspects of the integration between browser and email. The one for which I could not find some existing add-on was the ability to show a visual indicator that new mail is ready (even if not automatically downloaded)
Verdict
Should you download Thunderbird Biff?
Thunderbird Biff runs on
Windows 9X/ME/2K/XP/2003/Windows 10/11
and is available under the
Freeware
license
— the installer is 64 KB.
We’ve catalogued it under
E-Mail Tools.
✓
Verified clean. Every Thunderbird Biff build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.
Sponsored
At a glance
Thunderbird Biff specifications
- Last updated
- Nov 19, 2025
- License
- Freeware
- Operating system
- Windows 9X/ME/2K/XP/2003/Windows 10/11
- File size
- 64 KB
- Price
- Free
- Page views
- 466
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