I need twitter plug-in. [like twitter-fox or smth]

Is it "coming-soon" or "never-ever"?

The best I can do to help is this bookmarklet creator site http://www.twitlet.com/ it will create a bookmarklet for you after you have entered your username and password. Then highlight the javascript and drag to your bookmark bar.
I haven't tested this as I'm a failed twitter, hope it helps.
ps And I have no idea what twitter-fox or smth are!
pps Just tried it and it works - posted my first twitter since Nov 6th!

there's a extension called conwitter (www.conwitter.com); but it's still alpha. but it has nice features even its in alpha stage.

@ Sweet Baby Girl
I found 126 extensions related to Twitter here:
https://chrome.google.com/extensions/search/4?q=twitter
Did you even look there?
Could you have a look at these and then come back to us?

@Luc

Babies have to be taught to do everything ...

You should know that being the father of daughters

I recommend Chromed Bird: https://chrome.google.com/extensions/detail/encaiiljifbdbjlphpgpiimidegddhic

I seems that the OP has now disappeared, it is always nice to help people out...