XKCD Hovertext Chrome Extension

 This extension allows you to view xkcd mouse over text in a hover box instead of the normal built-in tooltip (which generally doesnt stay up very long and doesnt look nice, etc).

The appearance and behavior of the box is highly customizable (check out the options page for the extension).

Enjoy!

UPDATE: 
Version 1.6.1: update manifest to support https
Version 1.6: add support for customizing font and whether the text is 'small-caps' or normal
Version 1.5: upgraded to manifest v2; added what-if.xkcd.com support; removed Google reader support (since it has been discontinued)
Version 1.4 fixes bugs caused by new page layout on xkcd.com
Version 1.3 now supports Google Reader

How to install XKCD Hovertext chrome extension in chrome Browser

You can Follow the below Step By Step procedure to install the XKCD Hovertext Chrome Extension to your Chrome Web browser.

• Step 1: Go to the Chrome webstore https://chrome.google.com/webstore or download the extension XKCD Hovertext Chrome Extension Download from https://pluginsaddonsextensions.com
• Step 2: Now search for the XKCD Hovertext in Chrome Webstore Search and click on the search button.
• Step 3: click on the XKCD Hovertext Chrome Extension Link
• Step 4: in the next page click on the Add to Chrome button to Download and Install the XKCD Hovertext extension for your Chrome Web browser .