1. autopagerize - ‘Next page’ links become a thing of the past; pages load automatically as you scroll down. A lifesaver for viewing your dashboard feed, or any tumblr site. Also works on any site with pagination (i.e. Google)
2. TumblrLoginS - Perma-login and instant switching between multiple accounts. Reload your browser after installing this script. The setup screen will pop up. Insert usernames/passwords/titles for all your tumblr acounts. The plugin sits at the top-left of your browser window on all sites except gmail. Left click to select an account to activate.
3. tombloo - The best reblog plugin, covers all media types on several services. Setup is very straightforward if you’re used to working with Firefox plugins.
Warning: The last two are of Japanese design, and as far as I know haven’t been covered in the English-speaking tumblr community yet. As such, you’ll have to deal with a lack of English documentation. I’ve done my best in this post to get your started using them.
Bonus: Finding your tumblfeed a bit lacking? Nothing to reblog? Check out the tumblr Mosiac viewer for some fresh content related to your own. Another great Japanese tumblr API innovation. Insert your tumblr username in the box under “GAIN ID” to get started.
Tombloo’s homepage in English: http://wiki.github.com/to/tombloo/home_en