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To download the Capture for JIRA browser extension, navigate to Test Sessions Capture (menu in the JIRA header) > Get JIRA Capture Extension browser extension. Alternatively, you can download it from the Chrome Web Store directly at this link.
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Download the extension file using Save Link As…  Image Removed
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Open the Chrome Extensions page by opening the wrench icon menu and selecting More Tools > Extensions.  Image Removed Image Added
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Drag the downloaded extension file from its folder into the extensions page to install.  Image Removed Image Added
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For more details about Google's installation policy, see http://support.google.com/chrome_webstore/bin/answer.py?answer=2664769