Last time I used multiple instances of Firefox I got banned from Addmefast. Just saying.
Why you try to use proxy?
For addmefast? Why? Theres no benefits of that, or sure there is if you try to generate points to several accounts.
EDIT:
Its depends type proxy you use and where. If you have an IP which you manually put on firefox proxy settings, sure its work. If you use like hidemyass addon, i dont know, never tested. With they web proxy it should work fine, i quess.
But heres a warning, examble:
Now you are in situation where you are connecting to addmefast with a IP provided from proxy.
On first time let say ip is 1.1.1.1.
On second time you connect from 2.2.2.2 to same account.
And so on, on some point it will be suspicious, right?
And even suspiciously is when you connect on same account from 2-3 different ip's on same time. Thats a ban, i think.
Offcourse if your doing that for different accounts its cool. But be sure your proxy connects from same IP today and tomorrow.
I have a sites, which will get you banned if your IP changes at all time. I dont know if addmefast check that, but
just saying..