What are these numbers and codes that are added to each my Wikipedia link when I click it in Gmail:
Who is responsible (who is tracking me -- Gmail or Wiki)? How to prevent it?
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usg are Gmail's tracking parameters which are applied to every outgoing link. If you inspect the email, you'll see the
<a> tag has a
data-saferedirecturl property containing this link. There are various tools to remove it, e.g. the URL tracking stripper Chrome extension.