Thanks, excellent! Rated 5 out of 5 stars

If you're like me, that is, if you tend to keep hundreds of tabs open, this is an excellent tool. However, almost everything can be improved, so here are two feature requests:
* The hotkey should be made configurable—on a German keyboard, Tabby is a bit uncomfortable to reach, you need to press CTRL+SHIFT+' to get the single quote. Worse, the key combination may be required by other applications.
* The height of the results list should be configurable, too. I often get dozens of search results in Tabby, but the list doesn't display more than six at a time, so you need to scroll to see all results. This makes sense for small screens and/or few tabs, but when you have a vertical resolution of 1,200 pixels it means most of it is going to waste and you need to more time to find what you're looking for.

Hi, tmaibaum. Thanks for your support. Those two features you suggested were quite useful, but I don't currently have time to do this. For now, the workaround is to manually edit the XUL bundled within the addon, if you know how fx addons work. If you don't, please tell me (qiuyinATgmail.com) your desired key binding and result list height, and I'd be happy to send you a customized Tabby when I'm free.

p.s.: I do have plan to update Tabby to make it compatible with the upcoming Firefox 4, though Fx4 has got built-in support for tab search.