/usr/lib/icedove/extensions/{54e72d7b-ed31-4736-854f-f517358f21ee} is in icedove-bidiui 0.9.7-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/icedove/extensions/../../../share/icedove/extensions/{54e72d7b-ed31-4736-854f-f517358f21ee}