resolve addon icon url

resolve-addon-icon-url.patch

diff --git a/toolkit/mozapps/extensions/internal/XPIProvider.jsm b/toolkit/mozapps/extensions/internal/XPIProvider.jsm
--- a/toolkit/mozapps/extensions/internal/XPIProvider.jsm
+++ b/toolkit/mozapps/extensions/internal/XPIProvider.jsm
@@ -6990,22 +6990,23 @@ AddonWrapper.prototype = {
         icons[32] = icons[48] = this.getResourceURI("icon.png").spec;
       }
       if (this.hasResource("icon64.png")) {
         icons[64] = this.getResourceURI("icon64.png").spec;
       }
     }
 
     if(this.isActive && addon.iconURL){
-      icons[32] = addon.iconURL;
-      icons[48] = addon.iconURL;
+      icons[32] = icons[48] = addon.iconURL.indexOf("://") >= 0 ?
+            addon.iconURL : this.getResourceURI(addon.iconURL).spec;
     }
 
     if(this.isActive && addon.icon64URL){
-      icons[64] = addon.icon64URL;
+      icons[64] = addon.iconURL.indexOf("://") >= 0 ?
+        addon.icon64URL : this.getResourceURI(addon.icon64URL).spec;
     }
 
     Object.freeze(icons);
     return icons;
   },
 
   get screenshots() {
     let addon = addonFor(this);