cache not fully clearing
When I type the first letter of a certain site, the full site automatically comes up but the old index page is used (www) not the new index page of the site (without www) so the site never comes up. The site is https://www.zeninthezone.com/ I've cleared cache cookies and history to no avail.
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Do you mean to open: https://zeninthezone.com/ ?
You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").
Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose, make sure to backup this data or make a note.
You can't recover from this 'forget' unless you have a backup of involved files.
If you revisit a 'forgotten' website, data for that website will be saved once again.