It's laisseZ, for Krist's sake.

common/content/events.js

@@ -1674,7 +1674,7 @@ var Events = Module("events", {
                 values: {
                     despotic: "Only allow focus changes when explicitly requested by the user",
                     moderate: "Allow focus changes after user-initiated focus change",
-                    "laisses-faire": "Always allow focus changes"
+                    "laissez-faire": "Always allow focus changes"
                 }
             });
 

common/locale/en-US/browsing.xml

@@ -101,7 +101,7 @@ want to bypass &dactyl.appName;'s key handling and pass keys directly to
                 <example><ex>:open Linus Torvalds</ex></example>
            </li>
            <li>
-               Any other value is passed directly &dactyl.host; and
+               Any other value is passed directly to &dactyl.host; and
                must be a valid URL or hostname.
            </li>
         </ol>