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It also works with Seamonkey 2.8 by modifying the install.rdf
Funziona anche con Seamonkey 2.8 modificando il install.rdf

Это отзыв для предыдущей версии этого дополнения (0.5). 

Hi, thanks for your review. Would you mind opening a ticket at https://github.com/vanto/tb-personal-level-indicator/issues and adding the changes you made to install.rdf? I can then support Seamonkey in future versions out of the box.
BR,
Tammo