I am using opera version 66.0.3515.27 and when I am trying to open a pdf nothing is happening. If I click the save button, the pdf is being downloaded as usual.

Refresh the "Download PDF files instead of automatically opening them in Opera" option, restart opera, clear cache, but nothing changed. Reset to default made Opera to open pdf using the embedded pdf viewer for 2 days and then the same symptom.

I have to admit that by removing the googletm-translator, the problem was removed! I am testing it all day today and it works fine

@nvmjustagirl Already disabled. Tried enable, close the browser, disable, close and then try but no luck.

thank you all but when I reset the Opera it works fine for the first time and then I have the same problem. Digging a little using the Developer mode, I found that there is an error. Opera is trying to load favicon.ico icon and the server returns error 401 (Unauthorized). Can this be disabled?
In some other cases the favicon.ico is not found and the server returns the below error.

Resource at '/favicon.ico' not found: No resource found
Cannot serve request to /favicon.ico on this server

Nothing changed.

I am using opera version 66.0.3515.27 and when I am trying to open a pdf nothing is happening. If I click the save button, the pdf is being downloaded as usual.

Refresh the "Download PDF files instead of automatically opening them in Opera" option, restart opera, clear cache, but nothing changed. Reset to default made Opera to open pdf using the embedded pdf viewer for 2 days and then the same symptom.