Firefox ignoring scrollTop

Hello guys,

i discovered a bug in this plugin. Description: When you click the “Load more”-button then Firefox (v51.0.1) jumps to the top, instead of resting at the position where you clicked.

In the javascript-file “grid.js” at /wp-content/plugins/wp-ultimate-post-grid-premium/core/js i made changes at line 668 and line 677. At line 668 firefox return 0 for the variable scrollV so it jumps simply to the top after clicking the buton. Also at line 677 firefox does not recognize the “scrollTop”-property.

Now the “insertPosts”-method looks like:

WPUltimatePostGrid.insertPosts = function(grid_id, posts) {
	//2017-02-02 - bugfixing for firefox get scrollV value
    var scrollV = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0,
        scrollH = document.documentElement.scrollLeft || document.body.scrollLeft;
	
    WPUltimatePostGrid.grids[grid_id].container.isotope('destroy');

    WPUltimatePostGrid.grids[grid_id].container.append(posts);
    WPUltimatePostGrid.grids[grid_id].container.isotope(WPUltimatePostGrid.grids[grid_id].args);

    // Restore the scroll offset, should be flicker free
    //2017-02-02 - bugfixing for firefox -> scrollV
	//document.documentElement.scrollTop = document.body.scrollTop = scrollV;
	jQuery(window).scrollTop(scrollV);
    document.documentElement.scrollLeft = document.body.scrollLeft = scrollH;
	
    WPUltimatePostGrid.updatePosts(grid_id);
    WPUltimatePostGrid.checkLinks(grid_id);
    WPUltimatePostGrid.filterGrid(grid_id);

    WPUltimatePostGrid.grids[grid_id].container.imagesLoaded( function() {
        WPUltimatePostGrid.grids[grid_id].container.isotope('layout');
        WPUltimatePostGrid.grids[grid_id].loading = false;
    });
};

Now it works. I hope this helps someone.