An automatic popup will appear on the bottom if it is more than the threshold(which can be set by the user). Add on Manager was improved, now telling how many seconds each addon would take extra for each page to load.This feature was previously found in Internet Explorer 6 in some Longhorn builds.

Download manager was introduced along with the ability to pause, resume or cancel downloads.

Standards compliance was greatly improved, with IE9 the first version of IE to pass the Acid3 test as of September 2011.

When clicked, the back/forward button changes its colours to match the colour of the logo of the website and there is no Home button.

(For Windows 7) Webpages can now be pinned to the taskbar.

Security was further improved with the inclusion of application reputation.

Performance improvements, including hardware acceleration.

The UI was redesigned to give a more cleaner look and occupy less space.

Internet Explorer 9 has a HTML5 score of 128 points, compared with IE10's 335 and IE8's 43.

IE9 passes both the Acid2 and Acid tests.For Acid3 scores that are listed as 100/100, note that IE9 had an initial score of 95/100 but with a test update on September 2011, the scores got increased to 100/100 by omitting some unnecessary requirements.Improved general performance and Tracking Protection, improved pinning

Improved general performance, slight UI changes, improved standard compliancy, tab rows Improved general performance and interop, user location tracking Support for CSS3 and SVG, new JavaScript engine Chakra Minimum system requirements are a 1 GHz processor, 512 MB of RAM, and 70-200 MB (depending on the operating system installed) of hard drive space.

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