It's been a long time since I used it, but Dolphin Browser used to support them. Chromium or webkit based, to the extent that early versions also had "Jetpack" available to distribute a newer build of the browser engine than was natively available.

Edit: still has an ad blocker add-on based on the Adblock Plus rules, and the browser has been updated within the past month. I believe it was the first tabbed browser on Android, and supports some useful features like definable gestures.