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I'm using Firefox Browser 96.0.2 and have started having issues with getting into the WalMart.com website without being asked go through a couple of security prompts. This is not an issue when I use Edge or Brave. We're also having some issues accessing our bank web site with screens not displaying properly and getting error message (no problems with Edge)
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Are these security prompts like CAPTCHA tests and sending you a code to verify your identity? Do any of the error messages refer to cookies?
Firefox 96 modified when cookies can be sent "cross-site" to conform to how it is done in Chrome and Edge. Obviously there are some site compatibility issues. (For example, Bing doesn't send Firefox the same cookies it sends to Chrome and Edge.)
To test whether this is the problem, you can temporarily roll back the main change to the Firefox 95 setting. This requires going under the covers:
(A) 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.
(B) In the search box in the page, type or paste laxByDefault and pause while the list is filtered
(C) Double-click the network.cookie.sameSite.laxByDefault preference to switch the value from true to false
Most likely, that will take effect immediately, but in some cases, you might need to clear existing cookies for the site or quit Firefox and start it up again.
Hopefully we will get a better understanding of how to set site-specific exceptions in the future so users can benefit from higher security on compatible sites.