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. With time MSF files become corrupted and can contain
garbage, so this is quick solution for the problem. This way, the program runs smoothly
and faster. If you want to read more about this issue and see how this tool works,
check out this
article. It supports version 2.0, but may work with older versions
too. Use it at your own risk.