a time ago have installed an add-on to firefox named 'zzzz'. an ad-blocker that is running at the moment.
now the output from the command whereis zzzz is:
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~ $ whereis zzzz
zzzz:
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~ $ which zzzz
the output from command
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~ $ locate zzzz
the output from the command
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~ $ locate firefox
why can't find the folder/s of zzzz add-on?