Comment 297 for bug 417757

omair, if you can't change your DNS, I've found that forcing AI_ADDRCONFIG as noted in #288, #289 and (importantly) #290
works nicely for me.

Also, if it causes trouble for you, you can just remove or comment out the ld.so.preload line.

I've applied it on 5 computers here at work w/ no issues and immediate improvements, where DNS changes are simply not an option.

I do also set:
network.dns.disableIPv6;true

in Firefox as well. But all the other apps on the system are now working nicely (wget, ssh etc).