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
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You can check if you can start Firefox in Safe Mode by holding down the Shift/Options key.
See if you can use the Profile Manager to start Firefox in Offline mode.
Try to start Firefox with the about:blank page by creating a copy of the current Firefox desktop shortcut and add a space and -url "about:blank" 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":