I am having trouble activating hyperlinks on most websites.
I don't know exactly when this started. I cannot logout of my bank with a text hyperlink, could not log into onstar because the button is not active for example. Underlined text hyperlinks seem to work OK.
I'd try starting Firefox in Diagnose Firefox issues using Troubleshoot Mode. If you don't have the issue while all of your add-ons, extensions, and themes are disabled, you can try adding them back in one by one until you find the culprit. You should look at the Extensions and Themes troubleshooting guide and the Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems article as well.
You could also try Creating a new profile.
Hopefully this helps!