ZotPlus offers a number of modules to extend the stock Zotero reference manager. The main focus is currently in Better BibTeX, but more things are forthcoming. See the list of projects above.

I release updates very frequently, and Firefox might not immediately pick up on them. The default check-to-update interval is 24 hours; if you’re impatient, go into about:config and set extensions.update.interval to any value you deem prudent (in seconds). Setting it to 1 will have FF perform a check for updates every second, which will keep FF very busy. Use with care.