In that previous thread you wrote that your problem might be caused by not giving Firefox to close down properly before shutting down the computer.

Are you using "Clear history when Firefox closes" to clear data like the disk cache and in that case closing Firefox can take more time and Firefox will finish pending tasks on the next start?

• Settings -> Privacy & Security
  Firefox will: "Use custom settings for history":
  [X] "Clear history when Firefox closes" -> Settings
• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

Thanks for the response.

"Firefox will finish pending tasks on the next start" That's something new.

I use custom settings for history.

I usually close FF only when shutting the computer at the end of the day. What I've been doing via batch command since 2022 (?) - because of the issue - is to allow 60 secs after exiting FF before shutting down the computer. This because I notice that if I exit FF and start it again immediately, FF would complain that it hasn't totally closed or a window would pop up asking whether to restart or quit FF. So, I give it time to properly close shop. It helps in minimizing occurrence of the issue on the next start up.

Before, I even created a batch command to help FF dump crash reports, if they existed, during exit, but now I just give it more time.

Have to report. As before, it doesn't work all the time.

Have to report. As before, it doesn't work all the time.

This because...

I created a batch command to close FF and delete xulstore.json. Apparently, the file is not being deleted every time, even when command is executed in administrator mode; hence, failure to fix the original issue at times.

I am introducing some seconds of delay after exiting FF before deleting xulstore.json. The initial tests show it's working.

We'll see.