I like how you say it as if it was temporarily disabled because it had a bug or something when in reality it wasn't implemented.
32 bit: http://www.google.com/chrome/intl/en/eula_dev.html?dl=unstab...
64 bit: http://www.google.com/chrome/intl/en/eula_dev.html?dl=unstab...
I've used the 32 bit package on Ubuntu (9.10 beta) and Debian testing the last weeks, no problems so far.
It was quickly surpassed feature and stability wise by the daily builds and somewhat difficult to find on the chromium site.
Best I can find for the former: http://www.chromeextensions.org/appearance-functioning/lastp...
I looked into the extensions API, but didn't find any hooks.
That's a link to nightly Chromium mac builds. I've been using that for the past several months.