How can I fix a Javascript Application syntax error on Firefox Nightly?

[Butt-head]

My main browser is Firefox Nightly, a 64-bit browser. 32-bit browsers are useless to me because I open up a lot of tabs at once.

That said, I've been getting "Javascript Application - Error: Syntax Error" lately. Anyone know how to fix this? The 32-bit version of Firefox does not produce this error, but again, it's only 32-bit and slows when I reach the 32-bit memory address limit.

[Drew]

If you have Social Fixer addon installed for Facebook - disable or remove it.. Fixed the issue for me!