Rated 1 out of 5 stars

doesn't work at 78.11.0 (64-bit)
I just can't find that button anywhere

Rated 5 out of 5 stars

Very convenient. Developers should have it included.

Rated 4 out of 5 stars

Does exactly what it says.

Rated 5 out of 5 stars

Works perfectly fine on TB 78.4
Once installed, it automatically places a restart button on the Mail Toolbar:
https://i.imgur.com/n8HDCqL.png

Rated 1 out of 5 stars

Does not work with Tb 78.4.0.

Rated 4 out of 5 stars

Works with Thunderbird 78.4.0 (64 bits).
The icon disappears by itself if it is placed on the tabs line.

Rated 1 out of 5 stars

When I used Restart Button for the first time, all my other add-ons were disabled.

Responding to developer:
It happened immediately after I pressed the restart button. Additionally, Thunderbird started not fully closing anymore. Some small part of it remained in the background (Process Explorer revealed that) and when I tried to launch it again, the system warned that "Thunderbird is still running". I am using Thunderbird 82 beta 1. Fortunately, I had backups of my profile and all is well again.

What makes you think Restart Button caused that?

The current beta versions (82.x) are extremely buggy, your problem has most likely nothing to do with the Restart Button. Thanks for responding.

Rated 5 out of 5 stars

works fine !W