diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6a22a97..3f56066 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -46,6 +46,7 @@ jobs:
                     NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
             -   name: Publish to Firefox
                 uses: yayuyokitano/firefox-addon@v0.0.6-alpha
+                if: github.ref_name == "master"
                 with:
                     api_key: ${{ secrets.AMO_ISSUER }}
                     api_secret: ${{ secrets.AMO_SECRET }}