For reasons related to networking or OPSEC, installing CyberChef locally may be a good idea.
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Download a release from https://github.com/gchq/CyberChef/releases
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Extract the release to a directory. On Linux, /opt may be a good choice for all users. For individual users, extract it somewhere in the home directory.
#+begin_quote mkdir -p path/to/directory/CyberChef/VERSION unzip -d path/to/directory/CyberChef/VERSION CyberChef_v10.19.4.zip
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Within the newly-created directory should be an html file with a name similar to CyberChef_v10.19.4.html, which varies by release version. Open this with your preferred browser.
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If desired, create shortcuts, bookmarks, etc for this private copy of CyberChef.
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OPTIONAL: these same steps can be used to extract CyberChef to a directory served by an internal or private web server, which can be used collaboratively without utilizing GHCQ, GitHub, or some other site out of your control. These sites can and do log requests and can see the requests made to CyberChef in their logs.