/etc/chromium.d/ublock-origin is in chromium-ublock-origin 1.13.8+dfsg-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 | #!/bin/sh
export CHROMIUM_FLAGS="${CHROMIUM_FLAGS} --load-extension=/usr/share/chromium/extensions/ublock-origin"
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