After investigation, I could determine that Thunderbird 128.11 under MacOS Sequoia 15.5 interferes with applications. EaseUS Todo Backup and McAfee often fail in their execution, but only whebThunderbird is active.

[wsm]

We'd like to hear more about your problem.  If you are still having a problem, please post at https://support.mozilla.org/en-US/questions/new/thunderbird where it will get quicker attention, because "discussion" in Connect is really just for discussion, not problem determination or support questions. Thanks