JSONovich - Firefox Addon is a Firefox extension that pretty-prints JSON content of various types directly in a browser tab. It uses the browser's native JSON parser and a custom-built formatter to produce its output.
Normally, Firefox would prompt to download JSON sent with the correct application/json mime-type
Extension Auto-Installer - Firefox Addon - This is a tool for extension developers tired of the usual test cycle: make a change, create a new extension build, install it in the browser (with wait time and confirmations), restart the browser, test. This extension will receive new extension packages on a TCP port, automatically install them and restart the browser if necessary
Where Am O? A helpful extension for AMO developers.
The only functionality right now is to clearly identify what AMO server you are on and let you switch between that page on others.
Add your own dev server by going to about:config and creating the pref extensions.whereamo
Console² - Firefox Addon is the JavaScript Console is used not only for JavaScript errors, but for CSS errors as well. This extension takes this into account by providing a simple possibility to display errors by type.
Console² lets you display errors filtered by type (Errors, Warnings, Messages), language (JavaScript, CSS, XML) and context (Chrome, Content)
Scriptify - Firefox Addon - Scriptify allows you to easily create and manage restartless add-ons made from Scriptish and Greasemonkey userscripts. Once you have created an add-on, Scriptify makes it easy for you to manage it, and can automatically update it to maintain compatibility with Firefox rolling releases
Add-on Compatibility Reporter - Help Mozilla make sure your favorite add-ons get updated for upcoming Firefox releases by using this extension to report whether they still work or are having some issues with alpha and beta releases
