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My Error Console is constantly spammed with the error message: TelemetryStopwatch: key "FX_SESSION_RESTORE_COLLECT_DATA_MS" was already initialized.

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Error: TelemetryStopwatch: key "FX_SESSION_RESTORE_COLLECT_DATA_MS" was already initialized Source File: resource://gre/modules/TelemetryStopwatch.jsm Line: 53

This error message is constantly spamming my error console. It happens every time a new window or new tab is opened, every time a page is reloaded, it also seems to happen when pages using AJAX type functions (facebook, webmail, etc..).

It makes it difficult for developers to use the error console because the console is always full of this error message.

The problem has been happening for months on all my windows machines that use Firefox. I keep checking Google thinking someone will have mentioned a fix but no luck so I decided to try to ask here.

Error: TelemetryStopwatch: key "FX_SESSION_RESTORE_COLLECT_DATA_MS" was already initialized Source File: resource://gre/modules/TelemetryStopwatch.jsm Line: 53 This error message is constantly spamming my error console. It happens every time a new window or new tab is opened, every time a page is reloaded, it also seems to happen when pages using AJAX type functions (facebook, webmail, etc..). It makes it difficult for developers to use the error console because the console is always full of this error message. The problem has been happening for months on all my windows machines that use Firefox. I keep checking Google thinking someone will have mentioned a fix but no luck so I decided to try to ask here.

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Someone is being nosy. That sounds like attempts at tracking your browsing through the Internet. Facebook has come under fire for invasion of privacy. It might also be malware. You could do a scan for malware just to check. Here are some anti-spyware options:

If these don't find it or can't clear it, post in one of these forums for specialized malware removal help: