I am aware of this [[https://support.mozilla.org/en-US/kb/clear-cookies-and-website-data-single-domain-android|info]] info which is how to delete cookies and site data for a single site. How do I do this for ALL sites? The "delete browsing data" page in the settings groups site data with browsing history, instead of cookies. Seems a bizarre combination. I use Firefox sync so don't want to delete my history across all my Firefox browsers just because one device won't delete site data in a sensible way.