Hi Harry, you would make that change in your Firefox through the Advanced Configuration Editor, about:config. Here's how: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''opaqueResponseBlocking''' and pause while the list is filtered. Firefox should display four matching preferences. (3) To disable the Opaque Response Blocking feature for all sites, double-click the '''browser.opaqueResponseBlocking''' preference to switch the value from true to false Note: I have not tested this myself.