fix(cdk): fix isFirefox check (#158)

* fix(browser-detection): fix isFirefox check

* fix(cdk): userAgent case sensitive checks

projects/cdk/utils/browser/is-IE.ts

@@ -1,3 +1,3 @@
 export function isIE(userAgent: string): boolean {
-    return userAgent.includes('trident');
+    return userAgent.toLowerCase().includes('trident');
 }

projects/cdk/utils/browser/is-edge-older-than.ts

@@ -1,7 +1,7 @@
 export function isEdgeOlderThan(version: number, userAgent: string): boolean {
     const EDGE = 'edge/';
     const currentVersion = parseInt(
-        userAgent.slice(userAgent.indexOf(EDGE) + EDGE.length),
+        userAgent.slice(userAgent.toLowerCase().indexOf(EDGE) + EDGE.length),
         10,
     );
 

projects/cdk/utils/browser/is-edge.ts

@@ -1,3 +1,3 @@
 export function isEdge(userAgent: string): boolean {
-    return userAgent.includes('edge');
+    return userAgent.toLowerCase().includes('edge');
 }

projects/cdk/utils/browser/is-firefox.ts

@@ -1,3 +1,3 @@
 export function isFirefox(userAgent: string): boolean {
-    return userAgent.includes('firefox');
+    return userAgent.toLowerCase().includes('firefox');
 }

projects/cdk/utils/browser/test/browsers.spec.ts

@@ -14,6 +14,7 @@ describe('Browsers', () => {
 
     it('isFirefox', () => {
         expect(isFirefox('firefox')).toBe(true);
+        expect(isFirefox('Firefox')).toBe(true);
     });
 
     it('isEdgeOlderThan', () => {