It appears to add fewer than other browsers, but I’m not quite sure why it adds “?channel=fenc&client=firefox-b-1-d” to searches when only the q/query parameter is needed for them to work.
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As far as I know, these parameters are added by Google.
They are part of the built-in search URL for Google:
I don’t know why channel shows as “fenc”, though; I have no idea where that is coming from.