Why firefox showing some strings instead of Facebook in windows 8
Solution 1:
The issue is with Kaspersky Private Browsing.
Open up KS and turn it off in the settings. If you just turn it off in the web browser it will keep having issues.
This just started happening today for me, so looks like Kaspersky stuffed up something.
Here is screen shot where to turn it off in Kaspersky Make sure to restart FF after turning it off.