Recently gmail team launched a new Pop style compose interface,when you click on compose pop new box. It is completely new for users and removed some of the menus of compose which decrease productivity. Most user complain that Formatting mail in new gmail compose is time consuming, and take more time to create and send mail.If you hate new compose interface so much that you want old in any how old compose for chrome is solution for it.
To install old compose extension, click setting Icon, and then Tools –> extensions. Then drag and drop downloded file to extensions page,follow installation dialog to complete installation.
After installation reload Gmail and then click compose to open old compose interface.
Till now there is only this extension or trick is available for getting old compose interface for Gmail and can be possible only in chrome. Overall application is nice and does what it promises to do, but even extension is free you you need to share about extension on Facebook and twitter.Extension is not listed in chrome store, you need do download from developer website, which create another question whether extension is safe to use or not.