Tools > Options > Privacy > Exceptions: enter address, select Block button. dialog window displays the website is blocked. Revisit and website changed to allow?
After following the steps described in my question to block first-party cookies, I continue browsing and return to the privacy settings only to find that Firefox has changed my preferences, without notifying me by the way. Where I had Block, the listed website now has Allow.
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I saw in user reviews that the Privacy Badger extension can do this, it applies its own judgments about which sites can set cookies. See:
https://addons.mozilla.org/firefox/addon/privacy-badger-firefox/reviews/
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
- Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
- Do NOT click the Reset button on the Safe Mode start window