Firefox cannot open certain sites
When I try to log onto a secure website, such as a bank or tax office, when you hit the log on button, firefox opens a new window, not in a tab, with just the address bar at the top saying search bookmarks and history, and goes no further. This has only happened recently, the problem does not occur in safari.
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems