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Much more of a problem than R-ref reported on August 11, 2013: NO Twitter looks @erikvold.com/NoTwitter-policy (from resources\no-twitter\lib\main.js) & the web site is no longer there. xD
*not to mention blank folders all-over-the-place in its file and the (crazy?) inclusion of 'addon-sdk', which balloons the file to ~hundreds of KB (space-case!) ;) :)
Sorz (!), givin' it 3/5 stars (https://www.youtube.com/watch?v=MgmFDjA8lxU) because of no VirtualBox installed on this machine, yet & can't review it. ;-$
When this add-on is enable you can't visit "www.twitter.com"! If you select it in new tab, your page will be blank and that's all.