Where is Location of Microsoft Edge Extension Folder that are installed from Microsoft Store?
Since extensions are appx packages, try C:\Users\%username%\AppData\Local\Packages
. Search for the folder starting with the extension name.
Edit: Actual source code is in the C:\Program Files\WindowsApps
You might need to change folder owner to yourself to gain access.
In your edge browser go to edge://version/ page and locate the Profile Path there that would look something like C:\Users\%username%\AppData\Local\Microsoft\Edge Beta\User Data\Default
Its located under
C:\Users\admin\AppData\Local\Microsoft\Edge\User Data\Default\Extensions