Using Google as the Default Search Engine for Thunderbird

Since v13, Thunderbird uses Bing as its default search engine and Google is not even a choice.
If you want to use Google you can do it installing an add-on:

1. Open "Add-ons" from the "tools" menu;
2. Search for "google"
3. Install "Google Search for Thunderbird"and restart.
4. Google should have been automatically selected as the default search engine now!