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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.
Element Hiding Helper for Adblock Plus
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.
Remote XUL Manager
Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.
Stylish Sync
Live HTTP Headers (clone)
View HTTP headers of a page and while browsing.
This is an unofficial "Live HTTP headers" clone, mainly to fix the Replay feature!
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.
Stylish-Custom
Font Finder
Requires Restart
FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.
Image Zoom (ugly fixes)
Link Properties Plus
Requires Restart
Provides extended link properties: size of linked file, last modified time, etc.
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.
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.
Tiny JavaScript Debugger
TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.
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.
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.
About Add-ons
Requires Restart
Adds an About button to extensions, themes, and languages in the Add-ons list.
Re-Pagination
See more search results etc. on one page, concatenating several pages together...
Modify HTTP Response
ACColorPicker
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
Joomla! Admin
Requires Restart
Joomla! Admin brings ease & convenience to your computer/workstation, by providing you with a ready-to-use menu options that balms your repetitive work :) Now, Go to the Administrator page or Duplicate the current tab to a new tab/window in a jiffy!!
To create your own collections, you must have a Mozilla Add-ons account.
