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MinimizeToTray is a Firefox Extension.

You can download it from the developer’s website or the Firefox Add-Ons site.

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This extension allows you to minimize Firefox to the System Tray, rather than the Taskbar.

After installing the extension, there are several ways to minimize the browser window:

First, you can go to the top of your browser and click File > Minimize to Tray:

 

 

Second, you can type Ctrl+Shift+M on your keyboard.

Third, you can right-click on the minimize button at the top right corner of your browser window:

 

 

All three processes will minimize the browser to the system tray:

 

 

Right-clicking on the Firefox icon (while it’s in the system tray) will bring up the following options:

 

 

 And there are also has a couple of customizations that you can find in its Options window: