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Using JavaScript Code Modules in Firefox 4 Add-Ons

The concept of a JavaScript code module in the Gecko layout engine was first introduced in Gecko 1.9. This post discusses how such code modules can be used to simplify preference and add-on management in Firefox 4 which uses Gecko 2.0 and JavaScript 1.8.5. It uses a simple Firefox add-on called HTML5toggle as an example of how to modify existing code to use Javascript code modules. A JavaScript code module is simply some JavaScript code located in a registered (well-known) location. JavaScript code modules are primarily used to share code between different privileged scopes. They can also be used to