They had one of the best browsers in the world at one point. Their sell-out path was hundreds of millions of dollars from GOOG to make their search engine the

They had one of the best browsers in the world at one point. Their sell-out path was hundreds of millions of dollars from GOOG to make their search engine the default, and, unspoken: allow FF to become an ugly, insecure, red-headed stepchild when compared to Chrome. Likely part of what took priority away from Thunderbird, at the time, too.