How to Detect New Element Additions in Browser Extensions?

Detecting Page Element Additions in Browser Extensions

Browser extensions face the challenge of monitoring dynamic web pages without direct access to their source code. Detecting when new elements are added to the page is crucial for implementing various functionalities.

Monitoring Element Additions

To monitor element additions, one might consider using setInterval() to repeatedly search for the target element. However, this approach is inefficient, wasting CPU resources.

Mutation Events: A Deprecated Option

Mutation events were once used to detect DOM changes, but they are now deprecated. This leaves continuous checking as the only viable option.

Continuous Checking

The following code snippet implements continuous checking:

<code class="javascript">function checkDOMChange() {
  // Check for new elements or modifications

  // Recursively call the function every 100 milliseconds
  setTimeout(checkDOMChange, 100);
}</code>

This function will continuously monitor the DOM for changes at an interval of 100 milliseconds. It provides a reliable method for detecting element additions in browser extensions, albeit with potential performance implications.

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