Webchunks I have just uploaded a new version of Webchunks to addons.mozilla.org. It's entirely rewritten for 3.5 and even 3.7a1pre, with new features and a lot of bug fixes. It's for instance now possible to show/hide the webchunks toolbar using one main-toolbar button reflecting the state of all webchunks ("normal" or "you have something to check there") and it's conformant to the Webslice 0.9 "specification" if you except the window.external.* methods. The new version is not compatible with the pre-1.0 versions so you could have to recreate your webchunks bar but I think you'll be very pleased with this new version.

For the time being, it's in the sandbox on addons.mozilla.org even if the add-on used to be trusted. It lost its "trusted" status for some reason unknown to me... Stay tuned...