improve release script, build archiveror source zip

build.bash

@@ -7,15 +7,30 @@ BROWSER=$1
 rm -rf "$dist"
 mkdir "$dist"
 find src/ -not -name "*.js" -exec cp '{}' "$dist" \;
-cp LICENSE.txt "$dist"
+cp README.md LICENSE.txt "$dist"
 npm run build
 
-cd "$dist"
+echo
+
+rm -f archiveror.zip archiveror-source.zip
+
 if [[ $BROWSER = 'chromium' ]]; then
+    cd "$dist"
     # the "applications" key is only supported on Firefox
     jq 'del(.applications)' manifest.json > mani.json
     rm manifest.json
     mv mani.json manifest.json
+    cd -
+elif [[ $BROWSER = 'firefox' ]]; then
+    echo -e "\nMaking archiveror-source.zip for Firefox..."
+    zip -r archiveror-source.zip src/ build.bash package.json package-lock.json webpack.config.js README.md LICENSE.txt
+else
+    echo "Invalid browser choice!"
+    exit 1
 fi
 
-zip archiveror.zip *.js *.html *.css *.png manifest.json LICENSE.txt
+cd "$dist"
+echo -e "\nMaking archiveror.zip..."
+zip archiveror.zip *.js *.html *.css *.png manifest.json README.md LICENSE.txt
+cd -
+mv "$dist"/archiveror.zip ./