Below, we have shared a step-by-step guide on preventing installing extensions in the Microsoft Edge web app.
If you dont find the Edge folder, right-choose Microsoft and selectNew > Key.
Name the new keyEdge.

Now, right-hit the Edge key and selectNew > Key.
Name the new key asExtensionInstallBlocklist
6.
Now, right-tap on the ExtensionInstallBlocklist and selectNew > String Value.

Name the new String (REG_SZ) key as1.
Now, kick off the Edge online window and take a stab at install an extension.
You will see a messageYour admin has blocked prompt.

The above method will also disable all active extensions on your Edge web app.
If you want to enable extension installation,delete the ExtensionInstallBlocklist you created in Step 5.
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