https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance and related links have instructions on how to obtain a performance profile for startup. > How to find requested 'browser's user agent string' ? Assuming you are asking because the bug reporter asked? It's not needed when reporting a Thunderbird issue.
Bug 1856146 Comment 2 Edit History
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https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance and related links have instructions on how to obtain a performance profile for startup. > How to find requested 'browser's user agent string' ? Assuming you are asking because the bug reporting process asked? It's not needed when reporting a Thunderbird issue.