What does the following warning message mean?

NoScript detected a possible cross-site scripting attack from https://2f71b15e5c19a.safeframe.googlesyndication.com to https://imagesrv.adition.com. Suspicious data: Error: Timeout! DOS attack attempt?,(URL) https://imagesrv.adition.com/banners/266/01/23/d5/c2/index.html?clicktag=https://dspcluster.adfarm1.adition.com/ redi?lid=7254953247061&gdpr=1&gdpr_consent=CP3….AyAHIAPAAA&gdpr_pd=0&userid=731…970843&sid=341&kid=607&bid=19 ..57&c=14368&keyword=&bidid=73…94&clickurl=https%3A%2F%2Fad4.adfarm1.adition.com%2Fredi%3Flid%3D731226436454403 5850%26gdpr%3D1%26gdpr%5Fconsent%2DCP3MC8AP3MFABCINAeEsAP%5FgAANgABCYJiFDhttps%3A%2FzMB44A.YAAAAAAAAAAA&h5Params= {}…..cryptic code shortened… Have I seen this before while surfing here?!?