Facebook has been slow today due to server isolation issue. Right now, people are facing 404 errors, slow loading of pages, image uploading issues and many more. Facebook seems to work fine sometimes and dead slow the other moment.
Most common issues currently faced are:
Photo upload failure
Very Slow loading
CSS related errors on specific pages
Crashing Firefox (3.5.8)
And many random errors
Facebook Tweet can be viewed in the picture below which states the reason.
More updates will follow soon.
I had also experienced Crashing of Facebook by using from Firfox! it works so much slow there & hangs too
Yup! FireFox distrubs Facebook alot infact it ask each time to install Apple Quick Time for no reason