Issue #1030. Get browser_name from the get_browser helper method.

webcompat/views.py

@@ -137,18 +137,22 @@ def index():
     ua_header = request.headers.get('User-Agent')
     bug_form.browser.data = get_browser(ua_header)
     bug_form.os.data = get_os(ua_header)
+    # browser_name is used in topbar.html to offer add-on downloads
+    browser_name = get_browser(ua_header).rsplit(' ', 1).lower()
     # GET means you want to file a report.
     if request.method == 'GET':
         if g.user:
             get_user_info()
-        return render_template('index.html', form=bug_form)
+        return render_template('index.html', form=bug_form,
+                               browser=browser_name)
     # Validate, then create issue.
     elif bug_form.validate_on_submit():
         return create_issue()
 
     else:
         # Validation failed, re-render the form with the errors.
-        return render_template('index.html', form=bug_form)
+        return render_template('index.html', form=bug_form,
+                               browser=browser_name)
 
 
 @app.route('/issues')