Is it more efficient at parsing the filter lists, or perhaps it somehow overcame the difficulty highlighted in this issue, which has caused Gundlach's extension to sometimes fail to block content (on Chrome, not Safari)?
I ask this mainly because of your motivation for taking up the project, Wladimir Palant; it seems as if you decided the time had come to move on to other browsers and then saw the creator of AdThwart struggling to find the time to keep developing his extension.
Then again you might just make this extension superior if it isn't already, much as you turned the original AdBlock for Firefox (which like Gundlach's early versions could only hide content rather than blocking it, albeit more due to the incompetence of the original developer than any limitations of the platform) into the veritable security/speed/annoyance-blocking powerhouse of Adblock Plus.

Oh, on a side note, are there any plans to port this to Safari? Gundlach developed a porting library that may prove useful (although it may need more work, because so far it is merely sufficient to port Gundlach's own extension).