TBTray - Native Win32 Thunderbird tray icon

After the x-th reincarnation of the MinimizeToTray add-on for Thunderbird broke in Thunderbird 68, it seems like it becomes more and more difficult, if not impossible, to solve the issue at hand - keeping Thunderbird minimized in the notification area when closing or minimizing it - using Web Extensions.

I know that BirdTray exists, and it's even cross-platform. However, it tries to solve way more problems than I have and uses Qt (no offense, I really like the framework), so it's not quite as light-weight as I think a background process should be.

So I decided to fork a program a friend of mine wrote - traktouch, as it solves a very similar problem. I could have written it from scratch, but this way I didn't have to write most of the boilerplate code.

Installation

1. Download the latest TBTray release.
2. Extract the archive anywhere you want, %localappdata%\TBTray would be a good place for instance. I would not recommend to put it in the same folder as Thunderbird, although it should be possible in theory.
3. Figure out whether you run a 32-bit or 64-bit version of Thunderbird. If you are not sure, check whether Thunderbird is installed in Program Files (64-bit on a 64-bit system, 32-bit on a 32-bit system) or Program Files (x86) (32-bit on a 64-bit system).
4. Launch the TBTray executable in the folder that matches your Thunderbird bitness, i.e. if you run a 32-bit Thunderbird, then run TBTray.exe in the 32-bit folder of TBTray.
5. To automatically start TBTray on Windows startup, run register.cmd in the folder that matches your Thunderbird bitness, i.e. if you run a 32-bit Thunderbird, then run register.cmd in the 32-bit folder of TBTray. If you ever decide to move the executable to a different location, you will need to run register.cmd again.
6. To completely uninstall, run unregister.cmd and delete the extracted files.

How does it work?

TBTray intercepts some window messages sent to Thunderbird, rejecting window minimize and close events and instead hiding the window and creating a tray icon.

To do this, TBTray checks for the presence of the Thunderbird main window, and if it finds the window, injects a library into the Thunderbird process to hook into the message queue. TBTray keeps running in the background, in case you want to restart Thunderbird at some point.

The close button just closes Thunderbird!

The most likely cause is that you have mail.tabs.drawInTitlebar set to true (which is the default value).

TBTray intercepts the close button by intercepting clicks in the non-client area (the title bar). This doesn't work when drawInTitlebar is true. A workaround for this is to install the Minimize on Close extension, which uses client-side javascript to intercept the close event and minimize instead.

Halp, how do I quit Thunderbird?

Through the File menu, or the context menu of the tray icon.

Note that the context menu exit option will not work if you have the Minimize on Close extension installed, in which case you will have to exit through the file menu.

Is there any sort of configuration?

This program does not come with any options, because it is just supposed to fix exactly the problem I had. Please fork the repository if you want the program to behave differently.