/usr/share/icedove/extensions/{54e72d7b-ed31-4736-854f-f517358f21ee}/platform/Darwin/chrome.manifest is in icedove-bidiui 0.9.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | skin bidimailpack classic/1.0 jar:chrome/bidimailpack-mac-skin.jar!/skin/classic/bidimailpack/
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