Firefox sends everything you type in the address bar to google by default.

Would you be able to tell the difference between stock firefox and stock chrome if all you saw was the fiddler session? I don't know, I haven't tried. I did look at a firefox session in fiddler and I was not impressed.

Pick your poison. If you configure all the settings in firefox properly it might be acceptable. But can you just do the same in chrome? If not, you can use the privacy friendly chromium browser of your choice. Most firefox users wont take the time to configure it properly and the data will still reach the data gobbler.

Edit: an interesting comment from the other firefox thread https://news.ycombinator.com/reply?id=25916762