First, I recommend [[How to clear the Firefox cache|clearing the Firefox cache]] and [[Clear cookies and site data in Firefox|deleting Firefox cookies]]. This fixes most website issues. If that doesn't help, try [[Troubleshoot Firefox issues using Safe Mode|Firefox in Safe Mode]]. This special troubleshooting mode will temporarily disable add-ons and revert some settings. This will ensure that it's not a setting or extension that's interfering with the mentioned websites. If none of the above helps, it may be beneficial for you to share what error message(s) you are receiving.