Developer reply by Dillinger
Rated 4 out of 5 stars
The icons are very nice, but the addon itself often doesn't start with Thunderbird, why?
In that case, I always have to turn the addon off and then on to load it.
I can't reproduce this, what other add-ons do you have installed?
You can try to clear the startup cache:
Help > More Troubleshooting Information > Clear startup cache...
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