Adding an Extension (into Edge Dev) from a File

HiDennis_the_Canuck 

XPI file extensions can't be installed on Edge nor Chrome, because they belong to Firefox.

The xpi file extension is associated with Firefox or Mozilla web browsers and used for its plugins and add-ons. This is basically a ZIP file that, when opened by the Firefox browser utility, installs a browser extension. This extension applies to both Mozilla and Firefox browsers.

Edge supports .CRX files that is for both themes and extensions/add-ons

if this is what you are looking for

https://chrome.google.com/webstore/detail/google-analytics-opt-out/fllaojicojecljbmefodhfapmkghcbnh

then just open that page in Edge and press the button

you will be automatically prompted by Edge to allow extension install from other stores than Microsoft

you can toggle that option on/off from here too: edge://extensions/

for better handling of analytics in web from Google and other companies, installing ublock origin is a better option

https://chrome.google.com/webstore/detail/ublock-origin/cjpalhdlnbpafiamejdnhcphjbkeiagm

of course Edge already has Tracking Prevention built in: edge://settings/privacy