If by page tab you mean the Page Toolbar to change maps, you can install the Stylish plug-in for Firefox and apply the following style: @namespace url(<a href="http://www.w3.org/1999/xhtml" rel="nofollow">http://www.w3.org/1999/xhtml</a>);
@-moz-document url("<a href="https://app.roll20.net/editor/" rel="nofollow">https://app.roll20.net/editor/</a>") {
#page-toolbar {
height: 74%;
width: 78%;
background-color: #CCC;
border: 1px solid #000;
border-radius: 0px;
margin:0px;
padding: 0px 0px 0px 1%;
}
#page-toolbar .handle {
right: 200px!important;
}
#page-toolbar .container, #page-toolbar .pages {
height: 100%;
}
#page-toolbar .availablepage {
float: left;
width: 50px;
height: 50px;
margin: 0px;
padding: 0px;
}
}
