The most recent version of Chrome Dev, and probably other versions of the official Google browser as well, have received updates recently that introduce options to switch the interface to Material Design.
The feature is experimental at the time of writing, but it seems likely that Google will make the design the official one for Chrome in the future by switching to it permanently.
If you want to know more about material design, I suggest you check out Google's introduction to it. The company states:
We challenged ourselves to create a visual language for our users that synthesizes the classic principles of good design with the innovation and possibility of technology and science.
As mentioned earlier, the new designs are not enabled by default. Google added several experimental flags to Chrome's flags page that need to be activated before the new interface design becomes available.
There are five experimental flags that you can enable independently. They enable Material Design for the Chrome header (tabs and address bar area), and the pages History, Extensions, Downloads, and Policy Page.
Here is what needs to be done:
You can undo the change at any time by resetting the values of the experimental flags. Usually, this involves clicking on the disabled link or selecting disabled from the menu.
Update: Please note that Google enabled material design for some browser elements already. You may use the experimental flags to disable the new design. It seems likely however that Google will remove those flags eventually from the browser.
Update 2: Google removed some of the options to switch back to the classic Chrome design. Material Design is now part of the browser and no longer experimental.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.