I can get to website home pages but when I try to get to a logon screen, I get error msg "URL is not valid cannot open"
I cannot access certain pages such as facebook, yahoo, my bank. I sometimes get as far as their home page, but when required to say, go to mail... I get the url msg described above. Same thing when I try to login to online banking. Facebook I cannot login whatsoever. These are just 3 different sites I've tried so far.
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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).
- Don't make any changes on the Safe mode start window.
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.
- Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
- Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")