clipped from: en.onsoftware.com   

After browsing the Mozilla add-ons website for a while and doing some Google research as well, I found five experimental extensions for Firefox that seem to be quite useful. Take a look yourself and decide which one should pass the test. Now you have no excuse!

Automatic Save Folder – A great time-saver for power downloaders! With this extension you can create filters according to different criteria
CacheSearch – This extension lets you browse and search Firefox’s cache memory.
Quick Todo List – A tiny to-do list that sits on the browser’s status bar, in the bottom right corner.
FasterFox – This extension tweaks network settings in Firefox to improve its overall performance.
Shrunked – This seems a very promising add-on but I just couldn’t make it work. Shrunked detects when a website asks you to submit a photo and kindly offers to resize it for you.