diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 338ef24d7..a7d22f135 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -34,6 +34,7 @@ jobs:
           tag_name: steps.release_info.outputs.VERSION
           release_name: steps.release_info.outputs.VERSION
           draft: true
+          prerelease: true
       - name: Build all packages
         run: |
           tools/make-chromium.sh ${{ steps.release_info.outputs.VERSION }}
@@ -54,8 +55,8 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: dist/build/uBlock0_${{ steps.release_info.outputs.VERSION }}.firefox.zip
-          asset_name: dist/build/uBlock0_${{ steps.release_info.outputs.VERSION }}.firefox.zip
+          asset_path: dist/build/uBlock0_${{ steps.release_info.outputs.VERSION }}.firefox.xpi
+          asset_name: dist/build/uBlock0_${{ steps.release_info.outputs.VERSION }}.firefox.xpi
           asset_content_type: application/octet-stream
       - name: Upload Thunderbird package
         uses: actions/upload-release-asset@v1
@@ -63,6 +64,6 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: dist/build/uBlock0_${{ steps.release_info.outputs.VERSION }}.thunderbird.zip
-          asset_name: dist/build/uBlock0_${{ steps.release_info.outputs.VERSION }}.thunderbird.zip
+          asset_path: dist/build/uBlock0_${{ steps.release_info.outputs.VERSION }}.thunderbird.xpi
+          asset_name: dist/build/uBlock0_${{ steps.release_info.outputs.VERSION }}.thunderbird.xpi
           asset_content_type: application/octet-stream