Web and Developer Tools
DOM Inspector Requires Restart
DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.
SeaMonkey Debug and QA UI Requires Restart
Provides Additional Debug and QA UI for SeaMonkey development and testing.
User Agent Switcher Requires Restart
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
SQLite Manager Requires Restart
Manage any SQLite database on your computer.
Dafizilla Table2Clipboard Requires Restart
Mozilla applications allow to select rows and columns from a table simply pressing Control key and picking rows/columns with left mouse button.
The selection can be copied to clipboard but the original table disposition is lost making ugly results wh...
Live HTTP Headers Requires Restart
View HTTP headers of a page and while browsing.
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
Mnenhy Requires Restart
The primary goal of the Mnenhy project is to make some enhancements to SeaMonkey MailNews/Thunderbird, since there're still plenty of comfort functions missing if compared to Netscape 4.x and other mail and news clients.
DOM Inspector Plus! [dm] Requires Restart
Improved DOM Inspector! [dm version]. Box Model new layout & more data, see screenshot!. Horizontal scroll for Dom-Tree, and some more.
Inspects the structure and properties of a window and its contents.
MonkeyFix Requires Restart
Fixes up numerous SeaMonkey browser interface issues (eg. adding support for popup ALT attributes), as well as adding some handy features for developers and power users (eg. configure source viewer, work online/offline).
WorldIP - Geo Add-on with Security Features Requires Restart
Professional Geo Add-on with security features and advanced network tools. Anti-phishing. Protection against DNS spoofing and fake sites. All DNS records for domain. The real location of web server, country flag, extended information about datacenter
Image Zoom (ugly fixes) Requires Restart
An ugly attempt at fixing Image Zoom
RequestPolicy 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.
RefControl Requires Restart
Control what gets sent as the HTTP Referer on a per-site basis.
Stylish-Custom Requires Restart
custom additions to Stylish extension
HttpFox Requires Restart
An HTTP analyzer addon for Firefox
Link Properties Plus Requires Restart
Provides extended link properties: size of linked file, last modified time, etc.