"In terms of fixing the short-term problem of increasing
Thunderbird's user base, there are number of actions that can be
taken. Perhaps the easiest is starting to encourage and promote
Thunderbird add-ons. The equivalents for Firefox have turned into
one of the most powerful arguments for using it – and for not
being seduced by shiny new browser toys like Chromium/Chrome."
"I often hear people say that they couldn't live without a
particular browser add-on, but I've never heard the equivalent for
Thunderbird. That needs to change if Mozilla's email solution is to
become as central – and loved – as its browser."