diff --git a/fonts/resources/fira/fira-bold.otf b/fonts/resources/fira/fira-bold.otf
deleted file mode 100755
index 9087b0b..0000000
Binary files a/fonts/resources/fira/fira-bold.otf and /dev/null differ
diff --git a/fonts/resources/fira/fira-bold.woff b/fonts/resources/fira/fira-bold.woff
new file mode 100755
index 0000000..735352f
Binary files /dev/null and b/fonts/resources/fira/fira-bold.woff differ
diff --git a/fonts/resources/fira/fira.otf b/fonts/resources/fira/fira.otf
deleted file mode 100755
index 0d249dc..0000000
Binary files a/fonts/resources/fira/fira.otf and /dev/null differ
diff --git a/fonts/resources/fira/fira.woff b/fonts/resources/fira/fira.woff
new file mode 100755
index 0000000..b38ee14
Binary files /dev/null and b/fonts/resources/fira/fira.woff differ
diff --git a/fonts/stylesheets/fonts.less b/fonts/stylesheets/fonts.less
index ea25fd1..ff213cf 100755
--- a/fonts/stylesheets/fonts.less
+++ b/fonts/stylesheets/fonts.less
@@ -63,8 +63,8 @@
 
 .font ( 'fifteen', normal, normal, 'fifteen/fifteen.ttf' );
 
-.font ( 'fira', bold, normal, 'fira/fira-bold.otf' );
-.font ( 'fira', normal, normal, 'fira/fira.otf' );
+.font ( 'fira', bold, normal, 'fira/fira-bold.woff' );
+.font ( 'fira', normal, normal, 'fira/fira.woff' );
 
 .font ( 'fixedsys', normal, normal, 'fixedsys/fixedsys.ttf' );
 
diff --git a/fonts/stylesheets/stylesheet.css b/fonts/stylesheets/stylesheet.css
index 933e3a2..c1b624b 100755
--- a/fonts/stylesheets/stylesheet.css
+++ b/fonts/stylesheets/stylesheet.css
@@ -236,13 +236,13 @@
   font-family: 'fira';
   font-weight: bold;
   font-style: normal;
-  src: url('../resources/fira/fira-bold.otf');
+  src: url('../resources/fira/fira-bold.woff');
 }
 @font-face {
   font-family: 'fira';
   font-weight: normal;
   font-style: normal;
-  src: url('../resources/fira/fira.otf');
+  src: url('../resources/fira/fira.woff');
 }
 @font-face {
   font-family: 'fixedsys';