Setting default applications?

Haven't done this in a very long time so please correct me if I'm wrong &/or missing a step - hope this helps

I believe by adding these lines to the users com.apple.launchservices.secure.plist (Located -> '/Users/$USERNAME/Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist ')

    <key>LSHandlerRoleAll</key>
                <string>-</string>
            </dict>
            <key>LSHandlerRoleAll</key>
            <string>com.google.Chrome</string>
            <key>LSHandlerURLScheme</key>
            <string>http</string>
        </dict>
        <dict>
            <key>LSHandlerPreferredVersions</key>
            <dict>
                <key>LSHandlerRoleAll</key>
                <string>-</string>
            </dict>
            <key>LSHandlerRoleAll</key>
            <string>com.google.Chrome</string>
            <key>LSHandlerURLScheme</key>
            <string>https</string>
        </dict>
        <dict>
            <key>LSHandlerPreferredVersions</key>
            <dict>
                <key>LSHandlerRoleAll</key>
                <string>-</string>
            </dict>
            <key>LSHandlerRoleAll</key>
            <string>com.google.Chrome</string>
            <key>LSHandlerURLScheme</key>
            <string>ftp</string>
        </dict>
        <dict>
            <key>LSHandlerContentType</key>
            <string>public.html</string>
            <key>LSHandlerPreferredVersions</key>
            <dict>
                <key>LSHandlerRoleAll</key>
                <string>-</string>
            </dict>
            <key>LSHandlerRoleAll</key>
            <string>com.google.Chrome</string>
        </dict>

& then deploying a plist (i did it with a config profile -> "Custom Settings" with the plist passed as is displayed in secure plist above ie "com.google.Chrome" - you want to save the plist as "com.google.chrome.plist" before uploading it.

Image Example Below - "Upload_Field_Custom_Settings_Filename" is where you upload the plist.

You can upload the following plist & config it how you see fit,

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>DefaultBrowserSettingEnabled</key>
    <false/>
    <key>HomepageIsNewTabPage</key>
    <false/>
    <key>HomepageLocation</key>
    <string>www.Website Homepage.com</string>
    <key>RestoreOnStartupURLs</key>
    <array>
        <string>www.Website 1.com</string>
        <string>www.Website 2.com</string>
        <string>www.Website 3.com</string>
    </array>
    <key>RestoreOnStartup</key>
    <integer>4</integer>
    <key>ShowHomeButton</key>
    <true/>
    <key>IncognitoModeAvailability</key>
    <integer>1</integer>
</dict>
</plist>