Review for Trashcan by Michal Stanke
Rated 4 out of 5 stars
Works quite good. In fact, I have never looked inside the trash, but I feel much more confident, when it does exist.
Only one little bug I have found, when used together with Google Provider, when syncing after any event deleted, there is a warning window (MODIFICATION_FAILED).
To create your own collections, you must have a Mozilla Add-ons account.