Where does Chrome store extensions?

Storage Location for Unpacked Extensions
Extension engine does not explicitly change their location or add a reference to its local paths, they are left in the place where there are selected from in all Operating Systems.
Ex: If i load a unpacked Extension from E:Chrome Extension the unpacked Extension is still in the same location
Storage Location for Packed Extensions
Navigate to chrome://version/ and look for Profile Path, it is your default directory and Extensions Folder is where all the extensions, apps, themes are stored
Ex:
Windows
If my Profile Path is %userprofile%AppDataLocalGoogleChromeUser DataDefault then my storage directory is:
C:UsersAppDataLocalGoogleChromeUser DataDefaultExtensions

Linux
~/.config/google-chrome/Default/Extensions/

MacOS
~/Library/Application Support/Google/Chrome/Default/Extensions

Chromium
~/.config/chromium/Default/Extensions

Since chrome has come up with the multiple profiles you will not get it directly in C:UsersAppDataLocalGoogleChromeUser DataDefaultExtensions but you have to first type chrome://version/ in a tab and then look out for Profile path inside that and after you reach to your profile path look for Extensions folder in it and then folder with the desired extension Id