Making a Mint Mate App Launcher
The Guide shows you Step-by-Step How to Create a New Application Launcher inside to the Main Menu on Linux Mint Mate Desktops.
The Practical Example Here Illustrated is About Adding the Firefox Nightly Entry inside to the Internet Section a Linux Mint Mate Desktop.
The Technique is Useful for Adding Any New Software on a Linux Mint Mate Desktop.
To the Post Bottom there is a Link to Guide for Installing the Chrome Browser on Linux Mint.

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Right Click on Main Menu >> Edit Menu
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On Main Menu
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Select the Applications Group for the New Launcher
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Select New Item
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- On the Create Launcher Select the Icon
Here Below Link to Article with Tutorial 4 Locating Files/Icons Under Linux.
Linux How to Locate Command