Disable pdfjs in qutebrowser as it stops working randomly

.config/qutebrowser/config.py

@@ -625,7 +625,7 @@ c.content.notifications.enabled = False
 # can still be downloaded by clicking the download button in the pdf.js
 # viewer.
 # Type: Bool
-c.content.pdfjs = True
+c.content.pdfjs = False
 
 # Enables or disables plugins in Web pages.
 # Type: Bool