Make sure you are not blocking content. https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop also see https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/ https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection --------------- [https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode Diagnose Firefox issues using Troubleshoot(Safe) Mode] {web link} A small dialog should appear. Click '''Start In Troubleshoot(Safe) Mode''' (not Refresh). Is the problem still there? Many site issues can be caused by corrupt cookies or cache. '''Warning ! ! ''' This will log you out of sites you're logged in to. You may also lose any settings for that website. * [https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored Delete cookies to remove the information websites have stored on your computer] {web link} * [https://support.mozilla.org/en-US/kb/how-clear-firefox-cache How to clear the Firefox cache] {web link}

Sample link, [https://www.amazon.com/Inventing-Individual-Origins-Western-Liberalism/dp/0674979885/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr= https://www.amazon.com/Inventing-Individual-Origins-Western-Liberalism/dp/0674979885/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr=]

[https://www.amazon.com/Inventing-Individual-Origins-Western-Liberalism/dp/0674979885/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr= Sample link]

Did you try in Safe Mode, works for me? see screenshot

Not working on this end. Screensnip included.

Ok, believe I have found problem. About:config setting 'network.http.sendRefererHeader' I had changed from default value 2 to 1. Returned to default setting of 2 and things seem to be working fine. Thanks for the help.