HiVisGnome Jumbo
Use a Mozilla Firefox theme developed for people with problems seeing normal-size icons and text.

Magic's Video - Downloader
Save videos from various Web sites in FLV format.

Chipmark for Firefox
Keep track of your bookmarks.

PDF Download
Open, download, or view Adobe Acrobat files as PDF or HTML files.

gDocsBar
Quickly upload, access, and manage Google documents from a handy Firefox sidebar.