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this post was submitted on 27 Nov 2023
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Doesn’t it just clean up the link or does Firefox actually know which part of the link to remove?
What do you mean?
How does it know what part of the link is the site tracking?
Looks like it has a list of global and site specific parameters that it is safe to remove.
Generally, most are variables prefixed with
utm_
They likely built an index from most of the Analytics services also.
I think it's a combination of things, a basic approach of removing the query string (after the question mark) with exceptions for different sites that might need some of the query string.