Ensure we support Firefox ESR

Author: philwareham

dist/textpattern/jquery-ui.css

@@ -575,6 +575,7 @@ a.ui-state-default:focus {
   /* 4 */
   cursor: pointer;
   -webkit-user-select: none;
+     -moz-user-select: none;
       -ms-user-select: none;
           user-select: none;
 }
@@ -1549,6 +1550,7 @@ input.ui-button.ui-icon-notext .ui-icon {
   font-family: inherit;
   cursor: pointer;
   -webkit-user-select: auto;
+     -moz-user-select: auto;
       -ms-user-select: auto;
           user-select: auto;
 }
@@ -1921,8 +1923,7 @@ button:not(.ui-button):focus .ui-icon {
  * Default state icons.
  */
 .ui-state-default .ui-icon {
-  -webkit-filter: brightness(1.6666667);
-          filter: brightness(1.6666667);
+  filter: brightness(1.6666667);
 }
 
 /**
@@ -1937,8 +1938,7 @@ button:not(.ui-button):focus .ui-icon {
  */
 .success .ui-icon,
 .success.ui-icon {
-  -webkit-filter: brightness(2) sepia(1) hue-rotate(82deg) saturate(250%) brightness(90%);
-          filter: brightness(2) sepia(1) hue-rotate(82deg) saturate(250%) brightness(90%);
+  filter: brightness(2) sepia(1) hue-rotate(82deg) saturate(250%) brightness(90%);
 }
 
 /**
@@ -1954,8 +1954,7 @@ button:not(.ui-button):focus .ui-icon {
 .ui-state-highlight .ui-icon,
 .warning .ui-icon,
 .warning.ui-icon {
-  -webkit-filter: brightness(2) sepia(1) hue-rotate(4deg) saturate(500%) brightness(112%);
-          filter: brightness(2) sepia(1) hue-rotate(4deg) saturate(500%) brightness(112%);
+  filter: brightness(2) sepia(1) hue-rotate(4deg) saturate(500%) brightness(112%);
 }
 
 /**
@@ -1974,8 +1973,7 @@ button:not(.ui-button):focus .ui-icon {
 .error.ui-icon,
 .destroy .ui-icon,
 .destroy.ui-icon {
-  -webkit-filter: brightness(2) sepia(1) hue-rotate(-62deg) saturate(750%) brightness(65%);
-          filter: brightness(2) sepia(1) hue-rotate(-62deg) saturate(750%) brightness(65%);
+  filter: brightness(2) sepia(1) hue-rotate(-62deg) saturate(750%) brightness(65%);
 }
 
 /**
@@ -1990,17 +1988,15 @@ button:not(.ui-button):focus .ui-icon {
  */
 .information .ui-icon,
 .information.ui-icon {
-  -webkit-filter: brightness(2) sepia(1) hue-rotate(150deg) saturate(600%) brightness(80%);
-          filter: brightness(2) sepia(1) hue-rotate(150deg) saturate(600%) brightness(80%);
+  filter: brightness(2) sepia(1) hue-rotate(150deg) saturate(600%) brightness(80%);
 }
 
 /**
  * 'White out' (inversed) icons.
  */
 .ui-icon-inversed,
 #messagepane .ui-icon {
-  -webkit-filter: brightness(5);
-          filter: brightness(5);
+  filter: brightness(5);
 }
 
 /**
@@ -2016,8 +2012,7 @@ input[type=button] .ui-icon,
 .ui-state-hover .ui-icon .ui-icon,
 .ui-state-focus .ui-icon .ui-icon,
 .ui-state-active .ui-icon .ui-icon {
-  -webkit-filter: none !important;
-          filter: none !important;
+  filter: none !important;
 }
 
 /* Icon set.

package.json

@@ -37,7 +37,8 @@
   },
   "browserslist": [
     "> 0.5%",
-    "not ie < 11"
+    "Firefox ESR",
+    "IE 11"
   ],
   "scripts": {
     "build": "webpack -p --progress"