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Thunderbird freezes when starting new mail or reply
Last few days Thunderbird started crashing on Ubuntu 16.04. Receiving mails and reading works OK but soon as I try to reply or send new mail it just freezes and only Force Quit works. What to do?
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The first diagnostic is always to restart with add-ons disabled (it is on the help menu) most oddities like that have their source in add-on on Linux machines.