Allow administrators to set startpage to previous session and homepage

[RNicolson]

Edge and Chrome have both added options to allow administrators to set the startpage to be previous session and the home page. We would like to see this option made available in the JSON and mobileconfig settings for Windows and macOS administrators. According to the policy templates page (https://mozilla.github.io/policy-templates/) the options for startpage are the following

Value Description

none	Start with a blank page (no homepage, no previous session).
homepage	Start with the homepage in URL policy.
previous-session	Restore the previous session (all tabs and windows reopen).
homepage-locked	Always force the homepage at startup, users cannot choose session restore. (Firefox 78)

Our internal teams would like the option to allow for both the home page and the previous session to open when the browser is opened. We would like it so it can either be locked to this or set but changeable by the user still after we set it.

You can see the Edge RestoreOnStartup options here for an example. https://learn.microsoft.com/en-us/deployedge/microsoft-edge-browser-policies/restoreonstartup. In this case it would be set to 6 instead of the previous 1 or 4 for last session or a URL. 

Chrome has a similar setting that can be configured.

[Jon]

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