LibraryThing Talk Greasemonkey Script
The LibraryThing Talk Greasemonkey script changes JavaScript "URLs" to real ones, allowing users to open many topics in multiple windows or tabs. We have instructions and the librarythingtalk.user.js script available here.
LibraryThing Select Firefox extension
The LibraryThingSelect Firefox extension provides right-click accessibility for adding materials to a LibraryThing account, as well as offering links to ThingISBN and ThingTitle. We have instructions and the LibraryThingSelect.xpi (version 0.4, 8 July 2008, for Firefox 1.5 or higher) available here.