Review for Google Search for Thunderbird by Michel
Rated 5 out of 5 stars
and why it has to be installed manually :
Thunderbird got MONEY from Microsoft to make Bing (the sound that your head will do against the wall when you use it) the default search engine, but apparently the deal must also have involved preventing Google to be used... Yuck.
The module works perfectly with Thunderbird 52.4.0 despite the mention "this module is incompatible with your version of thunderbird"...
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