Cannot send emails on Yahoo mail. It works okay with Safari. I set default to Yahoo but still cannot send

Use MAC. Cannot send emails through Yahoo mail through Firefox but can send through Safari.
Also issue with Facebook. Using Firefox cannot sign out of account. Can sign out when using Safari.

Which security software (firewall, anti-virus) do you have?
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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