I don't know a direct way in about:config or elsewhere, but you can achieve
the same result also by overriding the CSS of the about:home and about:newtab
pages.
If not exist yet, create a userContent.css file inside a chrome folder in
your Abrowser profile directory; edit the file with this code:
@-moz-document url("about:home"), url("about:newtab") {
div[style="border: 1px solid rgb(215, 215, 219); border-radius: 3px;
margin-bottom: 40px; padding: 0px 15px 10px; color: rgb(74, 74, 79);"]
{display: none;}
}
Remember to restart Abrowser.
