I am not able to enter required security codes. "Enter these letters so we know you're human" just refreshes the page with a new code.
On two separate occasions, I tried to enter security codes to register on websites. Each time, the page refreshed with a new security code and no explanation. I had to go to IE in order to register on these sites. Not sure what settings are off or what to do next.
This happened
Not sure how often
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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
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the Safe mode start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")