diff --git a/README.md b/README.md
index 2cc919c..e624f04 100644
--- a/README.md
+++ b/README.md
@@ -27,12 +27,10 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=1598562#c13
 
 So you will have to include it to the host list of your OS.
 
-Nevertheless, consider installing Abrowser from Trisquel, Icecat (from Parabola or an unofficial build for Windows) and/or Iceweasel for Parabola. They lack that connection:
+Nevertheless, consider installing Abrowser from Trisquel, Icecat from Parabola and/or Iceweasel for Parabola. They lack that connection:
 
 [Abrowser](https://archive.trisquel.info/trisquel/pool/main/f/firefox/?C=S;O=D)
 
-[Unofficial Icecat for Windows](https://github.com/muslayev/icecat-win64)
-
 [Icecat for Parabola](https://repomirror.parabola.nu/sources/parabola/)
 
 [Iceweasel](https://repomirror.parabola.nu/sources/parabola/)
@@ -65,6 +63,19 @@ Follow this guide instead:
 
 [Add a search engine from the address bar](https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox#w_add-a-search-engine-from-the-address-bar)
 
+
+## Known problems
+
+Some breakage?
+Try changing "network.http.referer.XOriginPolicy" from 2 to 1
+
+Performance loss?
+Change these strings from false to true:
+javascript.options.ion
+javascript.options.baselinejit
+javascript.options.native_regexp
+
+
 ## Thanks:
 
 I really thank the following authors: