diff --git a/l10n/en-US/viewer.properties b/l10n/en-US/viewer.properties
index fb865aa50..c820d8068 100644
--- a/l10n/en-US/viewer.properties
+++ b/l10n/en-US/viewer.properties
@@ -41,6 +41,11 @@ print.title=Print
 print_label=Print
 save.title=Save
 save_label=Save
+# LOCALIZATION NOTE (download_button.title): used in Firefox for Android as a tooltip for the download button (“download” is a verb).
+download_button.title=Download
+# LOCALIZATION NOTE (download_button_label): used in Firefox for Android as a label for the download button (“download” is a verb).
+# Length of the translation matters since we are in a mobile context, with limited screen estate.
+download_button_label=Download
 bookmark1.title=Current Page (View URL from Current Page)
 bookmark1_label=Current Page
 # LOCALIZATION NOTE (open_in_app.title): This string is used in Firefox for Android.
diff --git a/web/viewer-geckoview.html b/web/viewer-geckoview.html
index e61578fb2..1046bfdea 100644
--- a/web/viewer-geckoview.html
+++ b/web/viewer-geckoview.html
@@ -87,8 +87,8 @@ See https://github.com/adobe-type-tools/cmap-resources
       <div id="mainContainer">
 
         <div id="floatingToolbar">
-          <button id="download" class="toolbarButton" title="Save" tabindex="31" data-l10n-id="save">
-            <span data-l10n-id="save_label">Save</span>
+          <button id="download" class="toolbarButton" title="Download" tabindex="31" data-l10n-id="download_button">
+            <span data-l10n-id="download_button_label">Download</span>
           </button>
           <button id="openInApp" class="toolbarButton" title="Open in app" tabindex="32" data-l10n-id="open_in_app">
             <span data-l10n-id="open_in_app_label">Open in app</span>