Can someone tell me how to install an extension into edge that I didn't download from the store, The load extension button is missing and I'm on build 14393.
Then you have an unstable system. Open PowerShell as Admin and type Code: Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" -Verbose} To reinstall Edge. Also make sure you are in Developer Mode on Settings->Update&Security->For Developers