/etc/chromium.d/tt-rss-notifier is in chromium-tt-rss-notifier 0.5.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # tt-rss-notifier extension loader
export CHROMIUM_FLAGS="$CHROMIUM_FLAGS --load-extension=/usr/share/chromium/extensions/tt-rss-notifier"
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