Unable to connect to PayPal in version 29.0 or 29.0.1
There seems to be some regression in the latest version of Firefox. I cannot connect with PayPal at all, receiving the message: "Unable to connect - Firefox can't establish a connection to the server at www.paypal.com." Using the exact same settings I am able to connect with Firefox 25 and 28. I have restarted in safe mode--no avail. Firefox 25 finds PayPal with normal browsing--Safe Mode off, as does 28.
Clear the Cache
Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"
If there is still a problem, Start Firefox in Safe Mode
While you are in safe mode;
Firefox Options > Advanced > General.
Look for and turn off Use Hardware Acceleration.
Poke around safe web sites and see if there is still a problem. Then restart.
What's going on: there's a difference in behavior between Firefox in Windows and Firefox in Linux. If you check the warning option for redirection (advanced settings), Paypal works in Windows but not in Linux. Uncheck it and Firefox works in both.
This is a bug in Firefox. Paypal won't do anything about it because Paypal works correctly in Windows and they don't give a damn about Linux.