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proxy issue in latest version of firefox on mac

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I am experiencing a proxy authentication loop on OSX, I have tried from 10.7 to 10.10. It occurs only on the new versions of Firefox. If I use the older versions of Firefox such as versions 36 or version 33 the constant authentication loop does not occur. The problem still occurs if the proxy username and password is saved in system preferences.

I am experiencing a proxy authentication loop on OSX, I have tried from 10.7 to 10.10. It occurs only on the new versions of Firefox. If I use the older versions of Firefox such as versions 36 or version 33 the constant authentication loop does not occur. The problem still occurs if the proxy username and password is saved in system preferences.

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Please consider your security certificate encryption or looking for error messages in the devtools. Without more information we cannot help, if you think it is indeed a bug, please consider taking troubleshooting to bugzilla.mozilla.org or the email list: https://lists.mozilla.org/listinfo