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The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.

Editors' Review

by   / November 07, 2008

Nightly Tester Tools has one killer feature: It allows you to resurrect dead Firefox extensions. If you've upgraded your browser from an older version, and the latest build has killed a much-needed add-on, this plug-in lets you return them to life on a case-by-case basis.

Nightly Tester Tools does other things, as well. It gives users the ability to control the titlebar display, takes screenshots, can analyze the leak log, copy the build ID to the clipboard, and copy the list of installed extensions to the clipboard. These function well enough, although we wouldn't recommend the plug-in for them without the compatibility override option. They can be hidden in a submenu under Tools in the Menubar.

Nightly Tester Tools works on Thunderbird and Sunbird, too. Of course, not all extensions can be brought back to life, but when the problem is only a small tweak such as compatibility setting, saving the day is as easy as installing a new plug-in.

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Full Specifications

What's new in version 3.6

Version 3.6 includes zh-CN locales from BabelZilla and basic Seamonkey support to title bar customization.


Publisher Dave Townsend
Publisher web site
Release Date August 05, 2013
Date Added August 14, 2013
Version 3.6


Category Browsers
Subcategory Firefox Add-ons & Plugins

Operating Systems

Operating Systems Windows XP/2003/Vista/7
Additional Requirements Thunderbird 3.6 or later

Download Information

File Size 114.88KB
File Name nightly_tester_tools-3.6-tb+sm+fx.xpi


Total Downloads 9,049
Downloads Last Week 1


License Model Free
Limitations Not available
Price Free
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