Currently, I am working on a Firefox extension that is designed to analyze the HTML content of web pages after they have been loaded in the browser. While I have successfully captured events like form submissions and link clicks, I am facing an issue with AJAX requests that silently submit data and update parts of the page without triggering these events. Can anyone suggest a method for trapping AJAX requests and responses within a Firefox add-on?
If you're looking to track page modifications rather than just detecting AJAX calls, utilizing mutation observers may be the way to go. Mutation observers, introduced in Firefox 14, allow you to react to DOM changes without adversely affecting browser performance. Here's an example of how you can implement this:
var observer = new MutationObserver(onDocumentChange);
// We want to monitor added/removed elements and text changes, but not attribute changes.
var config = { attributes: false, childList: true,
characterData: true, subtree: true };
// Begin observing the content document of the page
var doc = gBrowser.contentWindow.document;
observer.observe(doc, config);
The onDocumentChange function will trigger whenever there are modifications to the content document.
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