Greasy Fork

Just what I needed

I play a text-based game in messenger, this really opens up the page making all buttons available without scrolling most of the time. You can easily toggle the infopanel on the right at the same time for even more space by adding in lines 3, 6 & 10:

$("#showHideButton").click(function(){
    var convThreads = document.getElementsByClassName("_1enh")[0];
    var infoPanel = document.getElementsByClassName("_4_j5")[0];
    if(convThreads.style.display == 'none'){
        convThreads.style.display = 'block';
        infoPanel.style.display = 'block';
        showHideButton.value = "Hide Sidebar";
    }else {
        convThreads.style.display = 'none';
        infoPanel.style.display = 'none';
        showHideButton.value = "Show Sidebar";
    }