Change sets to lists

qutebrowser/browser/webkit/mhtml.py

@@ -319,7 +319,7 @@ class _Downloader:
         Args:
             url: The file to download as QUrl.
         """
-        if url.scheme() not in {'http', 'https'}:
+        if url.scheme() not in ['http', 'https']:
             return
         # Prevent loading an asset twice
         if url in self.loaded_urls:

qutebrowser/browser/webkit/webpage.py

@@ -300,7 +300,7 @@ class BrowserPage(QWebPage):
             else:
                 reply.finished.connect(functools.partial(
                     self.display_content, reply, 'image/jpeg'))
-        elif (mimetype in {'application/pdf', 'application/x-pdf'} and
+        elif (mimetype in ['application/pdf', 'application/x-pdf'] and
               config.get('content', 'enable-pdfjs')):
             # Use pdf.js to display the page
             self._show_pdfjs(reply)