There was a download of ThunderFix 1.0.3 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. ThunderFix lies within Internet & Network Tools, more precisely Browser plugins.
The following version: 1.0 is the most frequently downloaded one by the program users. ThunderFix.exe is the most common filename for this program's installer. We recommend checking the downloaded files with any free antivirus. This free software is an intellectual property of Parhelia Tools. The latest version of the software is supported on PCs running Windows XP/Vista/7/8/10/11, 32-bit.
From the developer:
Thunderfix is a small tool that can fix Mozilla Thunderbird performance. If you have more GB of emails stored in Thunderbird and if you are experiencing slow start time, slow navigation through email folders, you might try Thunderfix.
What Thunderfix does is that it detects *.msf files within your Thunderbird profile and removes them. After that, you can run Thunderbird and wait for new MSF files to be generated and you’ll see the improvement.
You may want to check out more software, such as Kiwee Toolbar, StorURL or SpyZooka, which might be related to ThunderFix.