I cannot open PDF files or attachments in yahoo mail using my firefox browser.
I cannot open PDF files or attachments in yahoo mail using my firefox browser.
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Can provide a screenshot showing your issue? When you say open, do you mean download or preview? see screenshot Did you try in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf
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