/usr/lib/thunderbird-addons/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/components/ is in xul-ext-lightning 1:24.4.0+build1-0ubuntu1.
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/usr/lib/thunderbird-addons/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/components/calBackendLoader.js
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