Provide the theme summaries for the following conversation: 

Don: do you have a minute?
Joyce: Sure, go ahead.
Don: I have a problem with my browser. It doesn't seem to load certain pages like fb for example. It's just a blank page.
Joyce: That's pretty basic, but have you tried turning it off and on again? ;)
Don: yes, but it hasn't helped.
Joyce: And have you tried it with the whole computer?
Don: yeah, that too, but the problem is still there.
Joyce: It's Firefox you're using, right?
Don: correct.
Joyce: You can try clicking on the drop-down menu in top right corner. Then go to settings, then safety & privacy where there's a section called something like "cookies and web data". You can try clearing the web cache - that usually helps. Let me know, if it works.
Don: ok, thanks a lot.

Summary: 
Joyce helps Don with his browser that does not load.