From:
https://support.mozilla.com/en-US/kb...nection_errors
Solution:
1. At the top of the Firefox window On the menu bar, click Tools, then select Clear Recent History....
2. In the Time Range to clear: drop-down, select Everything.
3. Click the arrow next to Details to display the list of items that can be cleared.
4. Select both Cookies and Cache.
5. Click Clear Now.
Or get a proper browser...