I go to '''about:memory''' > '''Save memory reports - Measure and save''' and then view the output, a report called '''memory-report.json'''. In this report I see approximately 30 blocks of text, each of which contains approximately 50 to 100 website URLs. Several blocks contain only porn URLs. I have viewed porn, but ''only'' in Google Images; I don't visit the websites. ''Why is this information being stored by Firefox?'' Note: my Firefox is set to '''Delete cookies and site data when Firefox is closed'''. However, even after closing and opening Firefox, ''all the information is still in the report''. A sample of two of these blocks of text is attached.