Opera 20 Developer is now available to Windows and Mac for testing. This version has brought Extensions Chrome.Downloads. API and offers the ability to drag tabs onto bookmarks bar. Mac version prompts for confirmation of exit when Command-Q is used, Windows version hasn’t got that feature yet.

Opera 20 Developer

Advanced Settings introduced in Opera 19 gets another option: use smaller speed dial thumbnails and Power-user mode offers new Width and Height of speed dial thumbnails.

Opera 20 developer

This version also includes Stash screenshot improvements, improved drag and drop between Speed Dial and Bookmarks Bar and performance improvements of theme loading.

You can download Opera 20 developer from here and here is link for full changelog.