Today's update added a Translate This Page (beta) icon to the search box. There appears to be no easy way to disable it and the little tinkering I did in about:config had no effect.
First, what's the idea of adding -- and taking up toolbar real estate -- an unremovable function I didn't ask for and will use infrequently if at all? Second -- and this really gets my goat -- not only do I have the unwanted icon in my search box, a drop-down dialogue box appears whenever I visit a non-English page. And as a polyglot translator living in Quebec, I visit many sites a day that are in languages other than English. Yes, the box will disappear if I click the Cancel button or anywhere on the page but that doesn't make it any less obtrusive and significantly increases the amount of clicking I have to do (hello, carpal tunnel syndrome!).
This is unacceptable and if it's not fixed soon, I, a devoted Firefox user since the earliest days, will be ditching the browser on all my devices for good.