Good to hear its at least partially working.
Linked Single tab is feature I depend on personally as well.
I investigated the issues but wasn't able to produce any of them as all the listed sites did function well enough for me.
I am not getting the errors you did are except the 'url.indexOf' which was due to deprecation in jquery of window.ioad(), it now fixed in the latest.
I think the attribute node error is non-problematic.
I suspect maybe a different addon might possibly be interfering?
I did have some problems extracting a lot of Reddit links due to their new methods of hiding the source material, so I massively reworked a lot of the code to support Reddit by querying their API and should place the extension to better support a more modular system so that we can tailor handling for each site more effectively.
I gave the new version a run through reddit, 4chan, imgur and google etc and didn't have any problems.
Its also possible it simply couldn't scrape any of the images out of the page your looking at, it should work fairly effectively on the reddit.com front page though.
Please update to img2tab v1.82 and try again I guess..
