Under installed apps I have two entries for Thunderbird: 1) 140.8.0, 2/25/2026, 244 GB (sic) and 2) 140.12.1, 7/2/2026, 250 GB. Is it safe to temove 1), and how is it possible to be that large an app?

Can I assume this is on Windows? Did you install either or both from an installer downloaded from < https://www.thunderbird.net/ > or from the Microsoft store, or other? Are they both 64-bit versions? In Windows. if installed from the official source, the default program would is "C:\Program Files\Mozilla Thunderbird". If installed from the Store, it would be installed somewhere like "C:\\Users\USER\AppData\Local\Microsoft\WindowsApps\" The reported size does seem way off. In my case. my Thunderbird program folder is about 300 MB. I have a fairly large Profile, with many years of saved email, and that folder is "only" about 7 GB. So, unless you have a gigantic archive (maybe tons of large attachments?), 250 GB seems unlikely. Seems to me that the OS is misreporting the size. What I would do is FIRST make a backup copy of my Profile. Then I would uninstall both versions, then re-install using an official installer. Finally, I would move my Profile copy into its proper place, if necessary (your original copy might show up on its own.) The exact steps depend on your operating system, so let us know what you have and we can proceed from there.