Review for OpenSearch by throwawaylogin
Rated 1 out of 5 stars
It doesn't say so in the description, but this initiates a Google web search in a Thunderbird tab. (I think I saw a search engine dropdown but it disappeared after a split second.) Thunderbird isn't a web browser. If you want the kitchen sink, get Seamonkey.
To create your own collections, you must have a Mozilla Add-ons account.