Might as well ask why Microsoft Hotmail seems like it will never support IMAP (it supports SSL Pop3 but if you read a message in another mail client, it's a nice modern convenience to have that message not show up as unread in another client).
From a developer perspertive, I am really scared everytime there is going to be a new browser in the market.
Anyone has the same experience as mine?
I wouldn't think anyone but Microsoft would be scared. The more browsers the better. As a developer you can't expect everyone to stay with FireFox2 There will always be something new and so having more choice creates competition and improves things for the user.
Realistically, you should be scared when there is a new /back-end/. The front-end doesn't do much. When they change the rendering engine (which they didn't) or the javascript VM (which they did), then you need to extensively test it.
Interesting. I expected Gmail to hold the majority share, rather than AOL/Hotmail/Yahoo. I guess I just spend too much time on the internet.
Gmail is relatively new compared to those other services you mention, which have been operating for years before Gmail started in 2004. As the article mentions, Gmail use is on the rise, and expected to overtake Hotmail's lead.