Fixed: Scrolling in Firefox in small window (requires refresh)

Closes #7142

(cherry picked from commit e3aa92d09a247f696a003b87f6e9511c33340a1d)

frontend/src/Components/Form/EnhancedSelectInput.js

@@ -12,9 +12,9 @@ import ModalBody from 'Components/Modal/ModalBody';
 import Portal from 'Components/Portal';
 import Scroller from 'Components/Scroller/Scroller';
 import { icons, scrollDirections, sizes } from 'Helpers/Props';
+import { isMobile as isMobileUtil } from 'Utilities/browser';
 import * as keyCodes from 'Utilities/Constants/keyCodes';
 import getUniqueElememtId from 'Utilities/getUniqueElementId';
-import { isMobile as isMobileUtil } from 'Utilities/mobile';
 import HintedSelectInputOption from './HintedSelectInputOption';
 import HintedSelectInputSelectedValue from './HintedSelectInputSelectedValue';
 import TextInput from './TextInput';

frontend/src/Components/Modal/Modal.js

@@ -6,9 +6,9 @@ import ReactDOM from 'react-dom';
 import FocusLock from 'react-focus-lock';
 import ErrorBoundary from 'Components/Error/ErrorBoundary';
 import { sizes } from 'Helpers/Props';
+import { isIOS } from 'Utilities/browser';
 import * as keyCodes from 'Utilities/Constants/keyCodes';
 import getUniqueElememtId from 'Utilities/getUniqueElementId';
-import { isIOS } from 'Utilities/mobile';
 import { setScrollLock } from 'Utilities/scrollLock';
 import ModalError from './ModalError';
 import styles from './Modal.css';

frontend/src/Components/Page/PageContentBody.js

@@ -3,7 +3,7 @@ import React, { Component } from 'react';
 import OverlayScroller from 'Components/Scroller/OverlayScroller';
 import Scroller from 'Components/Scroller/Scroller';
 import { scrollDirections } from 'Helpers/Props';
-import { isMobile as isMobileUtil } from 'Utilities/mobile';
+import { isFirefox, isMobile } from 'Utilities/browser';
 import { isLocked } from 'Utilities/scrollLock';
 import styles from './PageContentBody.css';
 
@@ -15,7 +15,8 @@ class PageContentBody extends Component {
   constructor(props, context) {
     super(props, context);
 
-    this._isMobile = isMobileUtil();
+    this._isMobile = isMobile();
+    this._isSmallScreenFirefox = isFirefox && window.innerWidth < 768;
   }
 
   //
@@ -41,7 +42,9 @@ class PageContentBody extends Component {
       ...otherProps
     } = this.props;
 
-    const ScrollerComponent = this._isMobile ? Scroller : OverlayScroller;
+    const ScrollerComponent = this._isMobile || this._isSmallScreenFirefox ?
+      Scroller :
+      OverlayScroller;
 
     return (
       <ScrollerComponent

frontend/src/Components/Tooltip/Tooltip.js

@@ -5,7 +5,7 @@ import { Manager, Popper, Reference } from 'react-popper';
 import Portal from 'Components/Portal';
 import { kinds, tooltipPositions } from 'Helpers/Props';
 import dimensions from 'Styles/Variables/dimensions';
-import { isMobile as isMobileUtil } from 'Utilities/mobile';
+import { isMobile as isMobileUtil } from 'Utilities/browser';
 import styles from './Tooltip.css';
 
 let maxWidth = null;

frontend/src/Utilities/browser.js

@@ -10,3 +10,7 @@ export function isMobile() {
 export function isIOS() {
   return mobileDetect.is('iOS');
 }
+
+export function isFirefox() {
+  return window.navigator.userAgent.toLowerCase().indexOf('firefox/') >= 0;
+}