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Several sites (PayPal and others) are no longer accessible via Firefox
Several sites (PayPal and others) that I have always been able to access using Firefox are no longer accessible via Firefox (so I have to use a different browser for these sites). It was suggested to me to delete cache and cookies; I have done that-it made no difference
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I can not reproduce this, so I believe this may be an extension. Try Troubleshoot mode to see if it works then. If it does, an extension is most likely the cause.
Try Firefox Troubleshoot Mode to see if the problem goes away. Firefox Troubleshoot Mode (previously known as Firefox Safe Mode) is a special diagnostic mode that temporarily turns off hardware acceleration, disables add-ons (extensions and themes) and resets some settings. See the Diagnose Firefox issues using Troubleshoot Mode article for details.
If Firefox is open, you can restart in Firefox Troubleshoot Mode from the Help menu:
- Click the menu button , click Help, select Troubleshoot Mode and click Restart in the "Restart Firefox in Troubleshoot Mode?" dialog that opens.
If Firefox is not running, you can start Firefox in Troubleshoot Mode as follows:
- On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
- On Mac: Hold the option key while starting Firefox.
- On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
(you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
When the Firefox Troubleshoot Mode window appears, select "Open".
If the issue is not present in Firefox Troubleshoot Mode, your problem is probably caused by an extension, theme or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.
To exit Firefox Troubleshoot Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again. (If you can't exit Firefox Troubleshoot Mode, please see Firefox is stuck in Troubleshoot Mode).
When you figure out what's causing your issues, please let us know. It might help others with the same problem.
Also, 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/