Try png, remove SVG logo;

img/9gag.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="2500" height="2500" viewBox="0 0 256 256"><path d="M0 0h256v256H0V0m59.99 88.74c.02 5.32.01 10.65.01 15.98 22.69 12.93 45.31 25.97 68 38.88 13.67-7.89 27.34-15.79 40.99-23.709.05 10.45-.061 20.89.061 31.34-13.591 8.09-27.41 15.789-41.051 23.8-13.67-7.95-27.41-15.8-41.11-23.7-9.06 5.12-18.09 10.279-27.13 15.43 22.66 13.23 45.51 26.141 68.24 39.26 22.67-13.01 45.4-25.899 68.029-38.989-.049-26.11-.039-52.22-.01-78.33-22.64-13.07-45.34-26.05-68.009-39.07A40988.169 40988.169 0 0 0 59.99 88.74z"/><path d="M100.27 96.58c9.27-5.26 18.48-10.64 27.73-15.94 9.301 5.31 18.57 10.68 27.88 15.97-9.31 5.32-18.59 10.66-27.88 15.99-9.23-5.36-18.53-10.62-27.73-16.02z"/><g><path d="M59.99 88.74c22.67-13.06 45.34-26.1 68.021-39.11 22.669 13.02 45.37 26 68.009 39.07-.029 26.11-.039 52.22.01 78.33-22.63 13.09-45.36 25.98-68.03 38.99-22.73-13.119-45.58-26.029-68.24-39.26 9.04-5.15 18.07-10.31 27.13-15.43 13.7 7.9 27.44 15.75 41.11 23.7 13.641-8.011 27.46-15.71 41.051-23.8-.121-10.45-.011-20.891-.061-31.34-13.65 7.92-27.32 15.82-40.99 23.709-22.69-12.91-45.31-25.95-68-38.88 0-5.329.01-10.659-.01-15.979m40.28 7.84c9.2 5.4 18.5 10.66 27.73 16.02 9.29-5.33 18.57-10.67 27.88-15.99-9.31-5.29-18.579-10.66-27.88-15.97-9.25 5.3-18.46 10.68-27.73 15.94z" fill="#fff"/></g></svg>

js/manifest.json

@@ -3,9 +3,9 @@
   "name": "9FOLLOW",
   "icons": [
     {
-      "src": "/9follow/img/9gag.svg",
+      "src": "/9follow/img/9gag.png",
       "type": "image/png",
-      "sizes": "2500x2500"
+      "sizes": "500x500"
     }
   ],
   "start_url": "/9follow/",