Add-ons
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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.25,576 users -
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.14,608 users -
![Icon for Classic Toolbar Buttons [Tb24-58] (discontinued)](https://addons.thunderbird.net/user-media/addon_icons/353/353047-32.png?modified=mcrushed)
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7 small view, Fx4-12 large view & Tb5-14) for current Firefox, Thunderbird and Seamonkey versions.3,048 users -
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.1,406 users -
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.628 users
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'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7 small view, Fx4-12 large view & Tb5-14) for current Firefox, Thunderbird and Seamonkey versions.3,048 users
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Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.237 users -
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.1,406 users
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Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.60 users -
Provides extended link properties: size of linked file, last modified time, etc.65 users -
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 datacenter94 users
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Adds a toolbar button to Composer to open the current file in another editor or browser.20 users
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Shows Desktop size image when you hover over a thumbnail .Works with many sites including Amazon, Facebook, Flickr, YouTube.1 user -
Add toolbar button for about-addons-memory-pm
But not only, also provide shortcuts for :
- Free Memory (needs free memory button)
- Abouts list page (about:about)
- Plugins page (about:plugins)
github.com/intika/about-addons-memory-pm1 user -
Adds an 'add custom tab' option to the Tabs drop-down menu of SeaMonkey's sidebar.37 users -
A full featured color selector tool, to work with colors, and easily find the colors you want.
很方便色取色器，可以页面上直接取色，然后再对颜色进行进一步的调整11 users
See all 108 extensions in Web and Developer Tools »
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