/usr/lib/xul-ext/webaccounts/chrome.manifest is in xul-ext-webaccounts 0.5-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | resource webaccounts content/
content webaccounts content/
overlay chrome://browser/content/browser.xul resource://webaccounts/browser.xul
|