7 Most Useful Firefox Add-Ons
These heavy-hitting browser add-ons act like applications that could easily replace their desktop counterparts.
1.) Animat 1.04
With Animat, you can create short animation clips saved in the APNG (animated portable network graphics) format. Although Animat installs as an add-on, it pops open and runs in its own Firefox browser window.
You can import images from several file formats (BMP, GIF, JPG, PNG) and sequence them in any order to create your animation. For what's supposed to be used for simple animation editing, Animat features a surprisingly deep toolset to crop, resize, rotate or reframe your source images. You can even reconfigure the work area (where the source and preview animation windows, and frame-by-frame timeline are positioned) to your liking.
https://addons.mozilla.org/en-US/firefox/addon/9820/
2.) FireFTP 1.0.8