I am reading a JavaScript error I try to open my Facebook and it'll open it up but will let me go anywhere else it just stays locked no screen no nothing how do I reset it or how can I clear or how can I fix it

I try to open my Facebook through Safari I use the debug to see what was wrong and is telling me I've got a JavaScript error how do I fix it reset it when it does open up all it does it show me a blank page it'll show me the friends application that chat in the world posting but nothing comes on no news feed know anything how do I fix a reset my jobless script for my safari