Scroll down the Q appmenu until you reach the Template (disp) section. That’ll open the dvm template. However it is not recommended to open the browser in the template because that may lead to profile fingerprinting. If you’ve already done so and wish to remove existing profiles run the following in the dvm-template:
[user@deb-11-firefox-dvm ~] rm -r /home/user/.mozilla
You should instead consider using Firefox’s autoconfig (as mentioned in the guide above: [Guide] Automatically install extensions and configure new (dispvm) hardened Firefox profiles with arkenfox user.js and policies) and/or Firefox policies. I wrote a brief explanation here:
How to install addons's or arkenfox profile in template vm so it is there in disposable vm? - #14 by BEBF738VD
update: the linked guide now contains a full explanations of policies as well.
For this issue specifically, add the following to the policies.json file mentioned in the guide:
"FirefoxHome": {
"Search": true,
"TopSites": false,
"SponsoredTopSites": false,
"Highlights": false,
"Pocket": false,
"SponsoredPocket": false,
"Snippets": false,
"Locked": false
},
"Homepage": {
"URL": "about:home",
"Locked": false,
"StartPage": "homepage"
},
This will disable everything unnecessary and will leave you with a plain homepage with a search-bar.