What does one do with downloaded add on .xpi files?

Windows 8 OS
Downloaded some add-ons--they were downloaded as .xpi files to my DL folder..
'DoNotTrackMe', 'NoScript, 'EasyUTubeVideoDownloader', 'Greasemonkey' and 'FoxyProxy'..
Should they be automatically recognized by Firefox (they're not)?
As far as I can tell, DoNotTrackMe and EasyUTubeVideoDownloader are available..
Should I assume FoxyProxy is running in the background upon opening Firefox?
How about NoScript? Same thing?
But GreaseMonkey--shouldn't I have a new menu for that within Firefox?
Thanks for any help.

It is usually best to use the install button on the home page to install an extension.
You can install extensions that you have saved locally by dragging the xpi file in a Firefox window or use File > Open File or Firefox > New Tab > Open File.
* http://kb.mozillazine.org/Installing_extensions

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