Revert workaround for #1323 (7b8c2df5e4aae96b47771c0bb90989765d719d5c) which may be contributing for data corruption issues. #1910

src/platform/$.coffee

@@ -552,25 +552,11 @@ if GM?.deleteValue? and window.BroadcastChannel and not GM_addValueChangeListene
 
 else
 
-  # workaround for Firefox 53 issue
-  $.currentValue = {}
-  $.GM_getValue = (key) ->
-    try
-      $.currentValue[key] = GM_getValue key
-    catch err
-      $.currentValue[key]
-  $.GM_setValue = (key, val) ->
-    $.currentValue[key] = val
-    GM_setValue key, val
-  $.GM_deleteValue = (key) ->
-    delete $.currentValue[key]
-    GM_deleteValue key
-
   unless GM_deleteValue?
     $.perProtocolSettings = true
 
   if GM_deleteValue?
-    $.getValue   = $.GM_getValue
+    $.getValue   = GM_getValue
     $.listValues = -> GM_listValues() # error when called if missing
   else if $.hasStorage
     $.getValue = (key) -> localStorage[key]
@@ -581,17 +567,17 @@ else
     $.listValues = -> []
 
   if GM_addValueChangeListener?
-    $.setValue    = $.GM_setValue
-    $.deleteValue = $.GM_deleteValue
+    $.setValue    = GM_setValue
+    $.deleteValue = GM_deleteValue
   else if GM_deleteValue?
     $.oldValue = {}
     $.setValue = (key, val) ->
-      $.GM_setValue key, val
+      GM_setValue key, val
       if key of $.syncing
         $.oldValue[key]   = val
         localStorage[key] = val if $.hasStorage # for `storage` events
     $.deleteValue = (key) ->
-      $.GM_deleteValue key
+      GM_deleteValue key
       if key of $.syncing
         delete $.oldValue[key]
         localStorage.removeItem key if $.hasStorage # for `storage` events