fix Firefox issues with file actions position and multiselect bar width

apps/files/css/files.css

@@ -89,7 +89,7 @@ table td.filename form { font-size:.85em; margin-left:3em; margin-right:3em; }
 #fileList tr td.filename>input[type="checkbox"]:hover:first-child { -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=80)"; filter:alpha(opacity=80); opacity:.8; }
 #fileList tr td.filename>input[type="checkbox"]:checked:first-child { -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)"; filter:alpha(opacity=100); opacity:1; }
 #fileList tr td.filename {
-	position:relative; width:100%;
+	position:relative; width:100em; /* not really sure why this works better than 100% … table styling */
 	-webkit-transition:background-image 500ms; -moz-transition:background-image 500ms; -o-transition:background-image 500ms; transition:background-image 500ms;
 }
 #select_all { float:left; margin:.3em 0.6em 0 .5em; }
@@ -100,6 +100,7 @@ table td.filename form { font-size:.85em; margin-left:3em; margin-right:3em; }
 	position:absolute; top:.6em; right:0;
 	font-size:.8em;
 }
+#fileList .name { position:relative; /* Firefox needs to explicitly have this default set … */ }
 #fileList tr:hover .fileactions { /* background to distinguish when overlaying with file names */
 	background:rgba(248,248,248,.9); box-shadow:-5px 0 7px rgba(248,248,248,.9);
 }