Username and password are being requested by

I can't open my firefox browser. An authentication required message pops up saying- a username and password are being requested by https://proxyvip.econ.mpg.de:444. The site says "Radius" - What do I do to get firefox working again? i can't do anything with it

You can check if you can start Firefox in <u>[[Safe Mode|Safe Mode]]</u> by holding down the Shift/Options key.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
See if you can use the Profile Manager to start Firefox in Offline mode.
*http://kb.mozillazine.org/Profile_Manager
Try to start Firefox with the about:blank page by creating a copy of the current Firefox desktop shortcut and add a space and <b>-url "about:blank"</b> to the target/command field.
If that allows to start Firefox then check the connection settings.
*Firefox > Preferences > Advanced > Network : Connection > Settings
*https://support.mozilla.org/kb/Options+window+-+Advanced+panel
If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.
See "Firefox connection settings":
*https://support.mozilla.org/kb/Firefox+cannot+load+websites+but+other+programs+can

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