All data is stored on your own computer, and is, therefore, under your own protection. No data is, at any time, transferred to any other party. Data should not be accessible to websites you visit, even if notes are open.
Troubleshooting information is collected for use in the "Bug Report" dialog (which may contain browsing session information), however this data is not transmitted off your computer without your action, and all transmitted data can be inspected beforehand..
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