diff --git a/CHANGELOG.md b/CHANGELOG.md
index af993ca32..e693ba4a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,9 @@
 
 ## v1.12.0
 
+**v1.12.0.9** *(2016-07-07)* - [[Userscript](https://raw.githubusercontent.com/ccd0/4chan-x/1.12.0.9/builds/4chan-X-noupdate.user.js)] [[Chrome extension](https://raw.githubusercontent.com/ccd0/4chan-x/1.12.0.9/builds/4chan-X-noupdate.crx)]
+- Partially revert removal of workarounds for old Chromium versions.
+
 **v1.12.0.8** *(2016-07-07)* - [[Userscript](https://raw.githubusercontent.com/ccd0/4chan-x/1.12.0.8/builds/4chan-X-noupdate.user.js)] [[Chrome extension](https://raw.githubusercontent.com/ccd0/4chan-x/1.12.0.8/builds/4chan-X-noupdate.crx)]
 - Restore `Restart when Opened` option.
 
diff --git a/src/classes/ShimSet.coffee b/src/classes/ShimSet.coffee
new file mode 100644
index 000000000..599834c75
--- /dev/null
+++ b/src/classes/ShimSet.coffee
@@ -0,0 +1,18 @@
+class ShimSet
+  constructor: ->
+    @elements = {}
+    @size = 0
+  has: (value) ->
+    value of @elements
+  add: (value) ->
+    return if @elements[value]
+    @elements[value] = true
+    @size++
+  delete: (value) ->
+    return unless @elements[value]
+    delete @elements[value]
+    @size--
+
+window.Set = ShimSet unless 'Set' of window
+
+return ShimSet