Firefox: We've covered a number of ways to make Firefox new tab page look somewhat similar to Google Chrome's: installing the Google Toolbar, or using add-ons like New Tab King or Speed Dial. Then there's New Tab JumpStart, which blatantly copies Chrome's new tab look.
It's an experimental extension, meaning you'll have to check one box saying you agree that it's not 100 percent approved, and it doesn't always play nice with other tab-controlling extensions like Tab Mix Plus (check the add-on comments for that particular fix). But JumpStart does do a darned good jobs of mimicking the features of Chrome's tab page. There's a customisable grid of your most visited pages, which you can "pin" for permanent position or "X" for removal. Then there's a familiar right-hand list of your recent searches, recent bookmarks, and recently closed tabs.
There are definitely a few kinks to be worked out, especially in the most visited thumb creations, as a good number of pages end up with white or blank thumbnails. And, depending on your browser/OS setup, the background can be either pristine white or clunky grey. If you want a decently close copy of Chrome's new tab page without installing a toolbar, though, it's hard to beat JumpStart's dedication.
New Tab JumpStart is a free and experimental download, works wherever Firefox does. Thanks Rudie!
New Tab JumpStart [Firefox Add-ons]