I would like to know the specific time range for when the "script execution" setting can run under dom.max_script_run_time

I've been exploring the Firefox configuration settings related to Dom.max_script_run_time

The default value is set to 10 seconds.

My ajax timeout is also configured for 10 seconds.

I have a grasp on how ajax timeouts work, starting from sending the xmlhttp request up until the response is received. However, I'm uncertain if Firefox's Dom.max_script_run_time includes the time that ajax waits for a response.

Here's an example scenario:

1. User clicks a button on the web page.

2. The onclick event triggers (Does Dom.max_script_run_time start here?)

3. JavaScript gathers input form data and constructs JSON.

4. The AJAX request is sent using the JSON string.

5. Main JS thread completes. (Does Dom.max_script_run_time end at this point?)

6. The xmlHttpRequest object continues waiting for the server's response.

7. The xmlHttpRequest object finally receives the response from the server.

8. The response text is displayed on the web page as part of the AJAX callback. (Does Dom.max_script_run_time end here?)

Is Dom.max_script_run_time paused at the end of the main JS thread because AJAX runs in a separate thread? In other words, is script execution timed per thread?

ajaxfirefox

Answer №1

The maximum execution time of a script refers to the duration during which a script is not actively running in the event loop. Its purpose is to provide users with the ability to terminate unresponsive scripts.

For instance, when conducting an asynchronous XHR request, there should be no issue (as the browser can continue processing user actions and events between the send() call and the callback execution, preventing the script from appearing inactive to the user).

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