diff --git a/doc-src/certinstall/firefox.html b/doc-src/certinstall/firefox.html
index 2652f5c6b..bb9ba05bb 100644
--- a/doc-src/certinstall/firefox.html
+++ b/doc-src/certinstall/firefox.html
@@ -7,7 +7,7 @@ app](@!urlTo("webapp.html")!@). If this fails, do the following:
 <ol class="tlist">
     <li> If needed, copy the ~/.mitmproxy/mitmproxy-ca-cert.pem file to the target. </li>
 
-    <li>Open preferences, click on "Advanced", then select"Encryption":
+    <li>Open preferences, click on "Advanced", then select"Certificates":
         <img src="@!urlTo('firefox3.jpg')!@"/>
     </li>
 
@@ -21,7 +21,7 @@ app](@!urlTo("webapp.html")!@). If this fails, do the following:
 ## Installing the certificate
 
 <ol class="tlist">
-    <li>Tick "Trust this CS to identify web sites", and click "Ok":
+    <li>Tick "Trust this CA to identify web sites", and click "Ok":
         <img src="@!urlTo('firefox3-trust.jpg')!@"/>
     </li>