I have Firefox (FF) 3.6 so am unfamiliar with the latest FF "protection features". From my understanding of the feature it is designed to block known "bad guys" from accessing your browser and using your browser to exploit sites which you regularly visit. That is, taking you to "spoofs" of sites you regularly visit.
In that sense
Using GoogleTranslator does not play into this At All.
If you wish to have a "secure financial transaction" option for your site you really need to contact the service whom you have hired to secure financial transactions and discuss the best way to provide secure financial transactions through your site and your visitors.
Best recommendation based on my personal opinion and NOT experience, contact the service whom you have hired to process financial transactions and see what they recommend.
Given what information you have so far shared, neither Firefox or Google Translate have anything, on this level, to do with secure financial transactions.