FIX #8154 Uglify for older firefox versions

angular.json

@@ -17,7 +17,7 @@
             "tsConfig": "apps/maarch_entreprise/js/angular/tsconfig.app.json",
             "styles": [],
             "scripts": [
-              "node_modules/hammerjs/hammer.min.js"
+              "node_modules/hammerjs/hammer.js"
             ]
           },
           "configurations": {

package.json

@@ -23,7 +23,9 @@
     "photoswipe": "^4.1.2",
     "tinymce": "^4.8.0",
     "tooltipster": "^4.2.6",
-    "zone.js": "^0.8.26"
+    "zone.js": "^0.8.26",
+    "uglify-es": "3.2.2",
+    "uglifyjs-webpack-plugin": "1.1.5"
   },
   "devDependencies": {
     "@angular-devkit/build-angular": "^0.6.7",