Install Google Chrome
PowerShell -Command "& {$P=$env:TEMP+'\chrome_installer.exe';$ProgressPreference='SilentlyContinue';IWR 'https://dl.google.com/chrome/install/latest/chrome_installer.exe' -OutFile $P;SAPS -FilePath $P -Args '/silent /install' -Verb RunAs -Wait;DEL $P}"
Install Mozilla Firefox
PowerShell -Command "& {$P=$env:TEMP+'\FirefoxSetup.exe';$ProgressPreference='SilentlyContinue';IWR 'https://download.mozilla.org/?product=firefox-latest&os=win&lang=en-US' -OutFile $P;SAPS -FilePath $P -Args '/S' -Verb RunAs -Wait;DEL $P}"
Can't copy, hit Ctrl+C!
Click above to copy, then paste it in the Start menu and run it.
You will be asked to confirm running the installer. After that, your browser will be waiting for you on your desktop.