[agjmills]

Somewhat important to note that its only the default in the US, India and a few other countries - presumably not the EU because of the whole Internet Explorer setting Bing as the default debacle a couple of years ago

[tjoff]

Not sure what you meant, google is the default in at least northern EU. Yahoo has never had any presence here so we have never been burdened with it.

[jlgaddis]

> Somewhat important to note ...

Yep, important enough that they noted it twice in TFA, including in the first paragraph:

> "... at least if you live in the U.S., Canada, Hong Kong and Taiwan."

[jwilk]

How and when they decide whether I'm in US etc. or not?

[robin_reala]

When you download an en-US localisation of the browser.

[azernik]

"This move makes Google Mozilla’s default search engine in most of the world, with the exception of China, where the default is Baidu, and Russia, Turkey, Belarus and Kazakhstan, where Yandex is the default."

That is, the deal with Yahoo only applied in the US, India, Hong Kong, et al.