Firefox has a hidden tab with Chinese characters.
The Firefox block on the taskbar line had Chinese characters displaying the current location. I closed all of my tabs and then clicked to quit Firefox. I then got a dialog box stating that I had multiple tabs open with Save, Quite, Cancel as options. The Chinese site was some how operating on a hidden tab. I had visited only sites such as BBC, Google Search, some trusted weather sites and downloaded some PDF from sites the McAfee had flagged as Safe. Any ideas?
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If you see CJK (Chinese/Japanese) characters on the Firefox title bar or the Windows Taskbar then that can happen if Firefox switches to UTF-16 encoding for some reason.
The "RealPlayer Browser Record Plugin" extension (Tools > Add-ons > Extensions) has been reported to cause that issue.
Be sure not to get confused with the RealPlayer plugin (Tools > Add-ons > Plugins) that plays media files. The extension adds some extra features like saving media files.
You can disable/remove the RealPlayer Browser Record Plugin extension in the RealPlayer Preferences (RealPlayer: Tools > Preferences > Download & Recording)
See also Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems