The algorithm periodically refreshes these tiles. If you stop visiting a site and start visiting another, the new site will eventually replace the old one [1].
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The chrome newtab mostvisited9 updated might have disrupted your muscle memory, but it ultimately serves a smarter browsing experience. By demoting frequency-spam and promoting meaningful domains, Google is trying to turn your New Tab Page from a history dump into an intelligent launchpad. The algorithm periodically refreshes these tiles