Normally when you invoke the About Thunderbird window, information about the current version and build is displayed. However, if you have installed the Mnenhy add-on, the correct build text may not be displayed.
The About Thunderbird window should now show the correct value.
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Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.3