Rated 4 out of 5 stars

Let;s start by stating you need to read up on the Mozilla add-ons and security.

I will paste it here for you to save you the trouble...

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"Have full, unrestricted access to Thunderbird, and your computer

The extension is using an older technology and has full access to Thunderbird’s internal APIs and does not need to request individual permissions. Up to Thunderbird 68 almost every add-on had this unrestricted access without specifically asking for it. Add-ons request this permission, as long as the new permission based API system does not yet offer the functionality they need.

Extensions requesting this permission might:

Change every aspect of Thunderbird’s user interface
Read and modify all your data (messages, contacts, calendars, web content and passwords)
Read, modify and execute any file on your computer

Add-ons published to addons.thunderbird.net (ATN) are subject to human review. If you install extensions from other locations, you have to be sure that you can trust the source. "
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This add-on is one such add-on and therefore it should be as safe as any other that requires this so called, no requesting permission.

I also wanted to point out (specifically to Firefox user aafc1b) that you can use a shortcut to open TB in minimised mode but you must install the shortcut into "shell: common startup" and not "shell:startup".

I have used this add-on, well, since I started using TB and never had any issues on a Windows 11 (or 10 for that matter) and it's a god send. Having to minimise using the minimise button doesn't bode well with other apps which do the same thing when you click the CLOSE button but as others have said, this should be something which is included in TB, but not necessarily activated/enabled by default.

adelphiaUK

Please excuse misspellings and anything that may not make sense or cause offence as the medication I take can have an adverse effect on my mind.

This review is for a previous version of the add-on (2.0.1.2).