A thunderbird 60.9.0 on Debian GNU/Linux stretch freezes during a few seconds (sometime one second and up to ten seconds). When frozen the characters entered while writing a mail are ignored and the menus are unresponsive. When the freeze is over, things resume normally. After a few days of observation nothing stands out as the root cause: it seems to be random, occurring as frequently as a few times per hour and sometimes only once every two hours.
Instead of trying to guess what could cause these freeze, I’d like to know how to properly diagnose them. I tried looking at the error console but nothing shows before or after the freeze.
Does anyone have a recommendation ?
P.S. I’m quite sure the freeze does not originate from a process unrelated to thunderbird overloading the machine etc. because other software such as Firefox do not exhibit the same problem.