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Conflict between Firefox and Thunderbird - FF side

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When FF is open and then I open TB, several new windows are created in FF. My default FF window disappears and is not present in the windows history. When I reset my computer, sometimes my default FF window reappears. When I do something in FF, TB immediately closes.

At first I suspected TB and put a question in the TB forum. I downgraded TB from 128.2.3 to 115.10.1 after disabling automatic updates of TB. Initially the problem seemed solved, but not so.

I am surprised the FF and TB seem to influence one another.

Working with FF 130.0.1.

When FF is open and then I open TB, several new windows are created in FF. My default FF window disappears and is not present in the windows history. When I reset my computer, sometimes my default FF window reappears. When I do something in FF, TB immediately closes. At first I suspected TB and put a question in the TB forum. I downgraded TB from 128.2.3 to 115.10.1 after disabling automatic updates of TB. Initially the problem seemed solved, but not so. I am surprised the FF and TB seem to influence one another. Working with FF 130.0.1.

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