I use this when I go to JIRA task pages and then paste the contents into the Harvest notes field. Saves me about 1.333 seconds repeating per occurrence.
If you do not get the pop up installer, then just save to desktop and then drag/drop it to your firefox window.
Also found: http://emm72.com/copy-title-firefox-extension
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If it does not install directly from the link, then just save the xpi file to your desktop then drag and drop it to Firefox.