I am hoping that they will add cached page searching for Firefox caches. I would DEARLY LOVE to make F/F cache HTML pages for something like 3 months and be able to search them easily. I am lax at bookmarking pages and often only vaugely recally certain words from a page I have visited in the recent past, and a regular Google search isn't enough to find it again.

Also Thunderbird mailbox searching would be good - I think they are standard mbox format so it should be fairly simple.

Then again there is no official Google Toolbar for Mozilla/FF so who knows?

Gareth