Remove preload support in FF

apps/block_scout_web/assets/js/app.js

@@ -20,9 +20,6 @@ import 'bootstrap'
 
 import './locale'
 
-// support of preload in Firefox
-import '../node_modules/fg-loadcss/dist/cssrelpreload.min'
-
 import './pages/address'
 import './pages/address/coin_balances'
 import './pages/address/transactions'

apps/block_scout_web/assets/package-lock.json

@@ -4126,11 +4126,6 @@
         "bser": "^2.0.0"
       }
     },
-    "fg-loadcss": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/fg-loadcss/-/fg-loadcss-2.1.0.tgz",
-      "integrity": "sha512-HpvR2uRoKvrYAEwimw+k4Fr2NVHYPfld5Lc/f9uy3mKeUTXhS5urL24XA2rqyq5b2i410EXCLir4Uhsb8J1QaQ=="
-    },
     "figgy-pudding": {
       "version": "3.5.1",
       "resolved": "https://registry.npmjs.org/figgy-pudding/-/figgy-pudding-3.5.1.tgz",

apps/block_scout_web/assets/package.json

@@ -25,7 +25,6 @@
     "bootstrap": "^4.1.3",
     "chart.js": "^2.7.2",
     "clipboard": "^2.0.1",
-    "fg-loadcss": "^2.1.0",
     "highlight.js": "^9.13.1",
     "highlightjs-solidity": "^1.0.6",
     "humps": "^2.0.1",