When you access twitter.com, a new icon (twitter logo) will appear in the omnibar, clicking it will hide / show the content wrapper in twitter.com, so you can see the profile background image.
You can Follow the below Step By Step procedure to install the Uncover twitter.com Background Chrome Extension to your Chrome Web browser.
It is the Uncover twitter.com Background Chrome extension download link you can download and install Chrome Browser.
Provides several tools to change the Twitter website to suit you.
Navigates to a twitter users' page by typing @
A lightweight Google Chrome extension for Twitter
Change twitter layout to full-width and bold in links
Makes the font size same for all tweets on the new Twitter profile pages.
Restores your own twitter background, instead of the horrible white one.