When Thunderbird Monthly upgrades, it opens a What's New page like this: https://www.thunderbird.net/en-US/thunderbird/135.0/whatsnew/?locale=en-US&version=135.0&channel=release&oldversion=134.0 Monthly shouldn't be showing a What's New page. Reported on version 135.0 (aarch64), originally installed through https://formulae.brew.sh/cask/thunderbird, updated lastly through the app itself, sometimes before through brew. Happened with the previous upgrade 133->134 as well. This seems to be limited to macOS. I wasn't able to recreate on Linux installed from thunderbird.net Thanks to https://github.com/orangesunny and https://github.com/judecooks for reporting this.
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When Thunderbird Monthly upgrades, it opens a What's New page in the browser like this: https://www.thunderbird.net/en-US/thunderbird/135.0/whatsnew/?locale=en-US&version=135.0&channel=release&oldversion=134.0 Monthly shouldn't be showing a What's New page. I'm able to recreate on a Linux install from thunderbird.net. Thanks to https://github.com/orangesunny and https://github.com/judecooks for reporting this.