diff --git a/apps/firefox/firefox.sh b/apps/firefox/firefox.sh
index d94044c..8847b5a 100755
--- a/apps/firefox/firefox.sh
+++ b/apps/firefox/firefox.sh
@@ -48,7 +48,7 @@ if choice 2>/dev/null; then
     $APT_INST apt-transport-https wget
     sudo install -d -m 0755 /etc/apt/keyrings
     wget -q https://packages.mozilla.org/apt/repo-signing-key.gpg -O- | tee /etc/apt/keyrings/packages.mozilla.org.asc > /dev/null
-    echo "deb [signed-by=/etc/apt/keyrings/packages.mozilla.org.asc] https://packages.mozilla.org/apt mozilla main" | sudo tee -a /etc/apt/sources.list.d/mozilla.list > /dev/null
+    echo "deb [signed-by=/etc/apt/keyrings/packages.mozilla.org.asc] https://packages.mozilla.org/apt mozilla main" | sudo tee /etc/apt/sources.list.d/mozilla.list > /dev/null
     $APT_UPDATE
     echo -ne "\n$APT_INST $PKG_FIREFOX\n"
     $APT_INST $PKG_FIREFOX