Twistie icons not showing in Firefox 68

When a locally hosted Seascape archive is opened in Firefox 68 or higher, the twistie icons are replaced with a different icon as shown in this screenshot:




The issue is caused due to a change in the way that the origin of the page is defined in Firefox starting with version 68. 



To resolve the issue, you'll need to set the privacy.file_unique_origin setting in your Firefox settings to false

Type about:config in your address bar, look for the privacy.file_unique_origin setting, and double click the Value entry so it changes to false:



After restarting Firefox, the twistie icons will be displayed normally:




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