diff --git a/src/buttons/button.scss b/src/buttons/button.scss
index 07d2a8d2..8bb69e0d 100644
--- a/src/buttons/button.scss
+++ b/src/buttons/button.scss
@@ -105,7 +105,7 @@
   // Keep :focus after :disabled. Allows to see the focus ring even on disabled buttons
   &:focus,
   &.focus {
-    outline: 1px dotted transparent; // Support Firfox custom colors
+    outline: 1px dotted transparent; // Support Firefox custom colors
     outline-offset: 2px;
     box-shadow: $box-shadow-focus;
   }
diff --git a/src/labels/counters.scss b/src/labels/counters.scss
index 018bd990..471ea1c8 100644
--- a/src/labels/counters.scss
+++ b/src/labels/counters.scss
@@ -12,7 +12,7 @@
   text-align: center;
   // stylelint-disable-next-line primer/colors
   background-color: rgba($gray-300, 0.5);
-  border: $border-width $border-style transparent; // Support Firfox custom colors
+  border: $border-width $border-style transparent; // Support Firefox custom colors
   // stylelint-disable-next-line primer/borders
   border-radius: 2em;
 
diff --git a/src/labels/diffstat.scss b/src/labels/diffstat.scss
index a8b59766..1badbb62 100644
--- a/src/labels/diffstat.scss
+++ b/src/labels/diffstat.scss
@@ -18,20 +18,20 @@
   height: $spacer-2;
   // stylelint-disable-next-line primer/spacing
   margin-left: 1px;
-  outline-offset: -1px; // Support Firfox custom colors
+  outline-offset: -1px; // Support Firefox custom colors
 }
 
 .diffstat-block-deleted {
   background-color: $bg-diffstat-deleted;
-  outline: 1px dashed transparent; // Support Firfox custom colors
+  outline: 1px dashed transparent; // Support Firefox custom colors
 }
 
 .diffstat-block-added {
   background-color: $bg-diffstat-added;
-  outline: 1px solid transparent; // Support Firfox custom colors
+  outline: 1px solid transparent; // Support Firefox custom colors
 }
 
 .diffstat-block-neutral {
   background-color: $bg-diffstat-neutral;
-  outline: 1px dotted transparent; // Support Firfox custom colors
+  outline: 1px dotted transparent; // Support Firefox custom colors
 }
diff --git a/src/labels/states.scss b/src/labels/states.scss
index 553dca07..6aadd35a 100644
--- a/src/labels/states.scss
+++ b/src/labels/states.scss
@@ -23,7 +23,7 @@
   white-space: nowrap;
   // stylelint-disable-next-line primer/colors
   background-color: $gray-500;
-  border: $border-width $border-style transparent; // Support Firfox custom colors
+  border: $border-width $border-style transparent; // Support Firefox custom colors
   // stylelint-disable-next-line primer/borders
   border-radius: 2em;
 }
diff --git a/src/navigation/underline-nav.scss b/src/navigation/underline-nav.scss
index 83b3acdf..68b8ab1b 100644
--- a/src/navigation/underline-nav.scss
+++ b/src/navigation/underline-nav.scss
@@ -29,7 +29,7 @@
   &:focus {
     text-decoration: none;
     border-bottom-color: $border-gray-dark;
-    outline: 1px dotted transparent; // Support Firfox custom colors
+    outline: 1px dotted transparent; // Support Firefox custom colors
     outline-offset: -1px;
     transition-timing-function: ease-out;
     transition-duration: 0.12s;
@@ -41,7 +41,7 @@
     font-weight: $font-weight-bold;
     // stylelint-disable-next-line primer/borders
     border-bottom-color: #f9826c; // custom coral
-    outline: 1px dotted transparent; // Support Firfox custom colors
+    outline: 1px dotted transparent; // Support Firefox custom colors
     outline-offset: -1px;
 
     .UnderlineNav-octicon {