Special Features in the Firefox AppSet
There are some special features you might want to investigate. These are commonly requested features to modify and manage the overall Firefox experience for the end users.
Preventing Extra Tabs at Firefox Startup
When you run Firefox for the first time, you see extra tabs, as shown In the figure shown.

The figure shown. Extra tabs appear when starting Firefox for the first time.
Video: Watch this video to see how to eliminate extra tabs on the first launch of Firefox https://www.policypak.com/video/endpointpolicymanager-remove-firefoxs-extra-tabs-at-first-launch.html
To disable the extra tabs, you can use the Options menu, as shown In the figure shown, and check the four options for disabling extra tabs in Windows 10.

The figure shown. Disabling extra tabs in the Options menu.
Changing the Firefox Default Search Engine
Changing the default search engine in Firefox is possible with CSE 1122 and later. It's located on the Extras tab as shown In the figure shown.
Video: Watch this to see how to change the default search engine in Firefox https://www.policypak.com/video/firefox-changing-the-firefox-default-search-engine-in-one-click.html

The figure shown. Specifying the search engine of your choice with Endpoint Policy Manager.