Check how to pin a website to taskbar on Windows 10.
This post gives a guide for Google Chrome, Firefox, Microsoft Edge surfing app, etc.
Click thethree-dot iconat the upper-right corner, clickMore toolsand clickCreate shortcut.

If you want to pin the website to Start, you might choosePin to Startoption.
What is Chrome Web Store?
In its properties window, you might check the file location of Firefox app.
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Copy the Firefox app location to a place for later usage.
ClickNextand key in a name for the shortcut and clickCreateto create a shortcut.
Step 4.At last, you might right-poke the shortcut and selectPin to Taskbar.

you’re free to then deleted the shortcut on desktop if you want.
Now you could tap the website icon at the taskbar to quickly initiate the website in Firefox surfing app.