[ Solved ] Can't download video from keepvid on Linux Chrome Java plugin absent
For Java and other NPAPI plugins in current Linux Chrome, there is no way to run them. And this will be the same for all Chromes by 2015 when all support for NPAPI is removed. See also:
http://blog.chromium.org/2014/11/the-final-countdown-for-npapi.html - The Final Countdown for NPAPI
If you absolutely need to run webpages that require Java, you will need to use another browser.