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cannot save bookmarks in toolbar when error message is unload: [SOLVED]

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[Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIObserverService.removeObserver]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://trustchecker/content/trustchecker.js :: anonymous :: line 955" data: no]

[Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIObserverService.removeObserver]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://trustchecker/content/trustchecker.js :: anonymous :: line 955" data: no]

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The problem has been solved by the submitter.

As it turned out the offending application was the ZoneAlarm Toolbar. After its removal adding bookmark(s) to FF toolbar was possible and the "Unload Exception" pop-up message ceased.