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Type REGEDIT in start menu search box or run and press Enter.
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Navigate to the following registry key:
HKEY\CURRENT\USER\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage
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Right-click on NewTabPage and select New -> DWORD (32-bit) Value. Name it NumRows.
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In the right-side pane, double-click on NumRows.
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In the Value Data box, type a value between 2 to 5. This value is the no. of tab rows that will be displayed.
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Click OK.
Now you will get more tabs in Internet Explorer 9 new tab page.