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View Dependencies Requires Restart
View Dependencies adds a tab to the Page Info window, in which it lists all the files which were loaded to show the current page.
Link Properties Plus Requires Restart
Provides extended link properties: size of linked file, last modified time, etc.
FavLoc Requires Restart
FavLoc allows you to set folders as "favorite locations" to which you can easily download. FavLoc menus will appear on the File menu (for saving pages), the context menu (for saving images and links), and on the download...
RequestPolicy v0.5 Legacy Requires Restart
Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.
XHTML Mobile Profile Requires Restart
Firefox does not natively support the mime-type application/vnd.wap.xhtml+xml. This is one of the possible mime-types for XHTML Mobile Profile. This addon adds support for this mime-type.
docked JS-Console Requires Restart
docks the JS-Console to the Bottom of the Browser
feel free to have a look at the source (see below) and suggest enhancements (borstel33 web de , Subject: docked JS-Console)
Validaty Requires Restart
One Click Validator. Provides you a button to validate a page using a validator like w3c or another user defined
Whois Lookup & Hosting & DNS & Site Flags Firefox Requires Restart
IP Whois Lookup & Website Reviews & Rating. Display country flag indicating website location. Alexa and Norton Antivirus Site Adviser. Supported: GoDaddy, NetworkSolutions, Dotster, 1and1, NameCheap, Register, Yahoo, 123-Reg, FatCow, Enom, FastHosts.
Stylish Tools Requires Restart
Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey
Slashy Requires Restart
Fixes Windows backslash file separators in links and images and other types.
Live HTTP Headers (Fixed By ITWorld.com.pk) Requires Restart
View HTTP headers of a page and while browsing.
Live HTTP Header Fix By Danyial ITs Working On Firefox Again Fixed Reply Problem
Restartless Restart
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
InspectorWidget Requires Restart
Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.
No More Install Delay
UPDATE: XPI delay has been removed in Firefox 40!
Disable the install delay in Firefox. New 2.0 version now includes GreaseMonkey scripts!
Unlike similar addons, this works on Firefox 4 and beyond.
To create your own collections, you must have a Mozilla Add-ons account.