def browser(request):
    context = RequestContext(request)
primary_cat_list = Categories.objects.order_by('category')
subcat_list = SubCategories.objects.order_by('sub_category')
product = Productbackup.objects.order_by('website')
browser = list(chain(primary_cat_list, subcat_list, product))
context['browser'] = browser
return render_to_response('reserve/templates/base.html', context_instance=
    context)
How do I pass variables to all templates in django?