Where are these 400 notices coming from?

I recently upgraded a System 76 Gazelle laptop from Fedora 43 to 44.

Intermittently I am seeing the following lines written to my terminal. Always in threes. The <verylongstring> is identical each time.

After this it goes quiet for a few days then happens again. I can't marry it up with anything specific happening on the machine at that time. I have several terminal windows open which are ssh'ing to other machines in my network but not doing any internet browsing or even running any browser at all.

Can anyone explain what might be causing these?

(as)
(asas)
(asas)
Safe Browsing server returned a 400 during update:request url = https::/safebrowsing.googleapis.com/v5/hashLists:batchGet?key=<verylongstring>, payload =
Safe Browsing server returned a 400 during update:request url = https::/safebrowsing.googleapis.com/v5/hashLists:batchGet?key=<verylongstring>, payload =
Safe Browsing server returned a 400 during update:request url = https::/safebrowsing.googleapis.com/v5/hashLists:batchGet?key=<verylongstring>, payload =