Several Fark-specific Firefox extensions have popped up over the years. Most of the functionality these extensions provide has recently been integrated into Fark and/or TotalFark -- for example, buttons for adding HTML/formatting to posts, quoting other users' posts, and highlighting posts from your favorite users. Because of this, we've removed this plugins page, as many no longer work correctly.
If you were using the "Farky" extension, we have a tool to import all your Friends lists and settings. Most other features it had can be enabled with checkboxes in your myFark Profile -- for example, marking the first new comment in a thread, highlighting your own name in others' posts, a color-blind mode for TotalFark, etc. Most of the remaining features are in beta (for example, noting which threads you've posted in or are mentioned in) and will be released later in 2010.