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You don't get a notification that the page is running slowly, either in an info bar or in a popup alert? Hmm, have you modified the dom.max_script_run_time preference in about:config to allow scripts to become non-responsive for longer than 10 seconds without a warning? If so, try restoring the default value of 10 or increase it to no more than 20 (as suggested in Warning Unresponsive script - What it means and how to fix it).

If that's not relevant/helpful:

If you open the Web Console before the trouble starts, are there any relevant-looking error messages in there? More info on that tool: https://developer.mozilla.org/docs/Tools/Web_Console

Thanks for your input/feedback

OK, so upon further testing, one of the requests continues to process in the background, the browser is useless on the site until it completes. The Animated dot indicating something is happening stops at 30 secs, but 10mins later when it is complete I can refresh and see the result.

I have edited dom.max_script_run_time making no difference

below are the headers in case there is some info in there that helps? (???????? represents the domain name)

POST https://?????????????????/generate_word_packinglist.php Transferred0 B (0 B size) Referrer Policy strict-origin-when-cross-origin

Accept text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Encoding gzip, deflate, br Accept-Language en-US,en;q=0.5 Alt-Used ????????????????? Connection keep-alive Content-Length 106 Content-Type application/x-www-form-urlencoded Cookie _ga=????????????; _gid=?????????????????; sec_session_id=c8b6a73fb6732a8740a5b697d3ed8fc8 Host ????????????????? Origin https://????????????????? Referer https://?????????????????/packinglist.php?sd=1623678800&day=6 TE Trailers Upgrade-Insecure-Requests 1 User-Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:88.0) Gecko/20100101 Firefox/88.0

I think those are the request headers. Is there any response?

I think those are the request headers. Is there any response?

it says 'No response data available for this request'

You know I missed the part about 10 minutes. Does the site use a service workers to receive new content in the background? Sites that have registered a service worker thread should appear on the about:serviceworkers page. I don't know how you can see the status of something that is in process via a service worker.

You know I missed the part about 10 minutes. Does the site use a service workers to receive new content in the background? Sites that have registered a service worker thread should appear on the about:serviceworkers page. I don't know how you can see the status of something that is in process via a service worker.

no it does not....

@jscher I have done some testing ....created a page that illustrates my issue [sent link as PM] and found that if the script returns nothing at all in the first 30 secs or so it just stops this is not an issue with before FF88 this is not an issue with other browsers

Another finding is that only happens when using https [sent link as PM] http persists until complete

Thanks for the example. On your page, the throbber never stops rotating, so it's hard to tell what Firefox is up to. I'm not sure what is happening.

For reasons I don't remember I have a test page that uses

<?php 
sleep(120);
?>
 

To create a two-minute delay in sending the page. These results also vary by protocol:

• http://www.jeffersonscher.com/res/sleep120.php => loads after 2 minutes
• https://www.jeffersonscher.com/res/sleep120.php => tab throbber disappears after about 35 seconds

If you have a lot of bandwidth and patience, you can isolate the patch that caused the change using a tool called Mozregression:

https://mozilla.github.io/mozregression/

@jscher thanks for your feedback.... I modified your sleep code to sleep based on the querystring value

using https it works for 29 seconds and times out without error message at 30secs http works perfectly for every value I entered