/usr/lib/thunderbird-addons/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/components/libical.manifest is in xul-ext-lightning 1:24.4.0+build1-0ubuntu1.
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1 2 | binary-component libcalbasecomps.so
interfaces caldatetime_libical.xpt
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