I get a JavaScript console log message each time an Ajax request finishes loading; the issue is demonstrated in the attached screenshot.

I don’t know how I activated this logging. How to deactivate it? I’m on ExtJS 4.1.
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It’s not an extjs issue! You click on the gear icon in the right bottom corner and uncheck Log XMLHttpRequests.
Chrome 111
Open the console, click settings (top right), uncheck "Log XMLHttpRequests"

Chrome 55
Open the console, right click the open area, uncheck "Log XMLHttpRequests" OR click the vertical "…" in the top right, go to settings, and uncheck "Log XMLHttpRequests" under the "Console" header.
older screenshot:

Older Chrome