/usr/share/xul-ext/tabmixplus/META-INF/mozilla.sf is in xul-ext-tabmixplus 0.5.0.0-1~deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | Signature-Version: 1.0
MD5-Digest-Manifest: wavotNy5VxZPW0J+eOGVHA==
SHA1-Digest-Manifest: 3f9/QYiv875CxRpRd6z4+jeR9lI=
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