topic Re: Thunderbird window automatic resizing in Discussions

Thunderbird window automatic resizing

PaoloAiello — Sun, 28 Sep 2025 17:46:39 GMT

If you leave Thunderbird running without performing any UI operations, the window occasionally automatically resizes to a default size. I don't know if this happens when new messages arrive or if it's something else. It's certainly very annoying and completely unnecessary.

Re: Thunderbird window automatic resizing

siffemcon — Sun, 28 Sep 2025 18:52:57 GMT

Try this.

Open your TB profile:

- TB menu > Help > Troubleshooting Information

- click the Application Basics > Profile Folder 'Open Folder' button

- close TB and delete the xulstore.json file in the profile folder

- restart TB

Re: Thunderbird window automatic resizing

PaoloAiello — Tue, 30 Sep 2025 16:15:09 GMT

Thanks, but it doesn't work. The window keeps resizing (the height is reduced, while the width remains the same).

Re: Thunderbird window automatic resizing

siffemcon — Wed, 01 Oct 2025 02:32:28 GMT

Does that also happen in https://support.mozilla.org/en-US/kb/troubleshoot-mode-thunderbird/?

Re: Thunderbird window automatic resizing

PaoloAiello — Sun, 12 Oct 2025 15:43:45 GMT

Thanks for your support. But I tried keeping other applications open, besides Thunderbird, which I usually keep open all the time, and I found that the other windows are also resized. So it's a problem with my operating system, not Thunderbird, and therefore this issue should be considered closed. Sorry for the unfounded report.

Re: Thunderbird window automatic resizing

siffemcon — Sun, 12 Oct 2025 23:02:27 GMT

NP, thanks for letting us know.