About this Collection
Add-ons for web development and extension development.
51 Add-ons in this Collection
Extension Auto-Installer is a helper for Firefox/SeaMonkey/Thunderbird extension developers: it allows automatically adding or updating browser extensions, e.g. via command line tools. This makes testing your changes easier.
Adds an about:addons-memory page that details add-on memory usage
Markdown document viewer.
Allows to visualize formatted markdown documents in browser.
Pretty-prints JSON content in the browser for easy, unobtrusive viewing.
Install Browser Extensions straight from GitHub Repositories
Easiest way to Add and Manage Custom User Styles in Firefox.
Add, Edit, enable, disable and delete in-numerous User Style Sheets to redesign the Firefox and the Web.
Developer Assistant by Ted Mielczarek, Gavin Sharp, others
A suite of tools for developers.
Foundstone HTML5 Local Storage Explorer allows for viewing, modifying and deleting of data items stored in the browser's LocalStorage. LocalStorage is a client side storage technology introduced in HTML5.
KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation
CSSsir is easy and handy tool which allows you to generate cross-browser code for main CSS- rules in a few clicks.
This CSS3 generator will be useful not only for web-masters and designers but also for common users.
A quick restartless magnifier to debug styles and web pages.
Feature rich XPath generator, editor, inspector and simple extraction tool...