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thunderbird update 45.4.0 tries to start with Lightning calender

FYI.

if anyone has problem the new thunderbird update 45.4.0 trying
to start with Lightning calendar and gets the "Add-ons Manager"
tab error message of a missing component, click the "Extensions"
to left.

in Lightning 'bar', select [Disable], restart thunderbird, problem
solved.

i do not use Lightning calender, so problem was easy to solve.

if you have been using Lightning calender, problem may not occur.