I think you misspelled "exclusion".

Hello71 · pde · commit 2a065a58606b · 2012-01-11T15:00:35.000-08:00
diff --git a/src/chrome/content/rules/Verizon.xml b/src/chrome/content/rules/Verizon.xml
@@ -8,7 +8,7 @@
   <!-- Ugh horrible exclusion to work around Verizon security bugs
   https://mail1.eff.org/pipermail/https-everywhere/2011-November/001237.html
   -->
-  <exculsion pattern="^http://www22\.verizon\.com/secure/pages/viewbill/" />
+  <exclusion pattern="^http://www22\.verizon\.com/secure/pages/viewbill/" />
 
   <rule from="^http://(?:www\.)?verizon\.com/" to="https://www22.verizon.com/"/>
   <rule from="^http://www22\.verizon\.com/" to="https://www22.verizon.com/"/>
