Categories

Default actions stay as usual. You can still "open the link in new tab" or "close tab" with middle-click. But now middle-click on an empty space on page to go back. In options, you can set middle-click to close the tab if no page to go back.

Click middle mouse button on an empty space on the page to go back.
And optionally, you can set middle-click to close the tab if no page to go back.

While keeping the old behaviors:
Click middle mouse button on a link to open it on a new tab.
Click middle mouse button on a specific tab to close that tab.
In Linux, click middle mouse button on a text input to paste selected text.

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For Google Chrome: http://goo.gl/cnR67