Some sites do funky Javascript things with their links. A link will point to a URL, but for whatever reason the page wants to use javascript to bring you to that URL. Ordinarily, you don't notice. You click, and you end up at the right page. But it's Javascript handling the click, not your browser's default link-clicking behavior.
On the Mac, Command-clicking a link opens it in a new tab. But that's only if Chrome is handling the click. If the page's Javascript is trying to be clever, it won't open a new tab. It'll act exactly as if you weren't holding down Command.
You can see this for yourself here: http://getglue.com/books/design_of_everyday_things/donald_norman
Try to Command-click on any of the "Similar" items in the sidebar. They all open in the current tab.
If you install this extension and refresh the page, they open in a new tab. Just like you said they should.
Disclaimer: This is a little bit of a hack. It might mess things up a bit, though I don't expect it to. If you have any trouble clicking on links, disable the extension, refresh the page, and see if it helps. If it does, please let me know on the support page.
Extore is a team of professionals who are passionate about creating extensions for web browsers. This devotion also gives us opportunity to appreciate work of other people. We get inspired by useful, open source extensions made by developers all over the world. Our strong belief is that one should share helpful add-ons with others. That’s why we’d like to present you our ever-growing list of favourite extensions that have inspired us. Moreover, as you probably have already learned, sometimes struggling for the best brings an end to the good. Talking about add-ons it often turns out that an upgrade is worse then previous version. Also it can become really tricky to get back to the beloved version of your favourite extension. That’s why we’re going to make not only the latest, but all versions of our favourite (and we hope yours too) add-ons available for download. No more compromises, just stick to the version you really like!