These extensions bring back the old features that has been removed on new Firefox
Squared tabs, appmenu, add-on bar, small button view and many more 'old' features for Firefox 29+ (Windows / MacOSX / Linux).
All builds & changelogs on versions page!
Gives you a place to put all your add-on buttons without over-crowding the navigation bar.
Status bar widgets and progress indicators for Firefox 4+
This restartless extension provides a separate downloads window.
Add RSS icon back into location bar (URL) in Firefox 4.0. This icon was showed in Firefox 3.5/3.6 by default when page offered feeds.
Causes Firefox 3's Location Bar "AwesomeBar" to look and act more like Firefox 2's old location bar.
Has an options menu to set things just to your liking.
Returns the 'Properties' menu item that was removed in Firefox 3.6 to the context menu.
Adds the window title back to the Firefox title bar on Windows and Mac.
Since Firefox 25, the FindBar was made independent for each tab. This addon reverts the FindBar to classic/global behavior.
This extension makes "Bookmark This Page", "Bookmark This Tab" and "Bookmark All Tabs.." behavior equal with Firefox2.
Add "Undo" and "Redo" menu in context menu of bookmarks.
Restore Linkinfo and FormInfo which has been deleted from PageInfo of Firefox3.
This extension does not seem to work on MAC.
Makes the default filename used for saving pages be based on the filename, rather than the page title (undoing a change in the default behavior from Firefox 18).
If you are using Console2, beginning Firefox 28, using -jsconsole on the command line will no longer open Console2 but instead opens FF's Browser Console. This addon allows dinosaurs like me to open Console2 by using -jsconsole2 on the command line.