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por Firefox user a3f102 em Março 23, 2019 · link permanente

How to reset the COUNTER

If you want to reset the COUNTER, you can do this in the Thunderbird preferences.

Open the "Preferences" (Unix) or "Options" (Windows) interface. On the "Advanced" page, select the "General" tab then click the "Config Editor" button.
Then search for "extensions.quicktext.counter" entry.

The value shows the current state of the counter.
Double-click the entry and change the value to 0.