After update to FF 30 I am no longer prompt proxy credentials

I use FF behind a corporate firewall/proxy that requires us to enter our user credentials when you access most of the Internet sites. I've just updated v30 this morning, and immediately after the restart of all these sites were blocked with a message 'Access denied' proxy saying he lacked my credentials. In the past (and other browsers) FF popup would be a prompt asking you for my credentials. Since the v30 update prompt is no longer displayed, I don't have the ability to authenticate and proxy blocking my access.

I tried to clear all caches, cookies, passwords, saved reset FF, and I even amazed my profile dir. Nothing seems to work. Advice, suggestions, etc. would be greatly appreciated.

Thank you.

Linux - RedHat Enterprise customer v6.5
FF v30

There was a change for Mac, but maybe the same change affects Linux? If please see this thread from yesterday and let me know if anything seems relevant to your operating system: "You are not authorized to view this page".

Edit: By clicking on through the article on DND, the same issue affects users of Mac and Linux, so the workaround may well help you.

Tags: Firefox

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