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"a web page is slowing down your browser" why?

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I have noticed the the yellow message "a web page is slowing down your browser" What triggers this message in FF.

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Which web page are you on when this happens?

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It was a bing.com page but other web sites can cause this message.

What causes this message to appear?

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”Webpage is slowing down your browser” This is the new way the browser tells you there is a problem with the script program(s). https://support.mozilla.org/en-US/kb/warning-unresponsive-script?cache=no

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So that would mean if no scripts where allowed in a web page that the message should never appear. right?

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That depends on the real cause of the problem.

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So htat goes back to my original question.

What causes the message "a web page is slowing down your browser" this message appears on all 3 operating systems I use.

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https://support.mozilla.org/kb/Clear+Recent+History#w_how-do-i-remove-a-single-website-from-my-history

Remove History For One Site

Open the History Manager <Control><Shift> H. In the search bar, enter the name of the site. Right-click on one of the listings and select Forget About This Site. This should remove all information, including any passwords / settings.

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That does not answer my question on how Firefox identifies a web site as slowing down.

Does FF have a measurement metric how is it used?

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Yes. Firefox keeps watch on the programs(scripts) it is running. If a program runs too long, an error message is displayed.

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What I am still looking for is at what point does FF say "a web page is slowing down your browser"

What would a script have to do or how slow does web site have to slow

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There are settings in the about:config page, but I don't remember what one.

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Is there a list of all about:config parameter?

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See also comments in the Firefox source code.

Note that some preferences are hidden and have a fixed default value and only show on about:config when you give them a value.

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Are firefox users allowed to change or make corrections to source code cor-el?

How can anyone use the source code you proivded?

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This happens on the New York Times web site (other places too.) I would really like to be able to use it. Pages also load very slowly. On Task Manager it says Firefox (5) or Firefox (6).

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kj2008 said

On Task Manager it says Firefox (5) or Firefox (6).

More than one process is normal for the current Firefox. http://www.ghacks.net/2016/07/22/multi-process-firefox/

Multi-process Firefox is codenamed "e10s". https://wiki.mozilla.org/Firefox/multiprocess

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Good to know about the Firefox (5) or Firefox (6). Could it just be unable to do so many things at once on this computer?

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I have experimented with reducing the upload speed and noticed the message appears more often.

However I was hoping to find a definitive value. does it count the number of TCP retries?

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I am still getting this yellow bar error, often on the NY Times web site. This is not the only place it happens. It also seems to momentarily "forget" that I have logged in. I've looked at Task Manager but don't see what I could do when it says Firefox is using a lot of memory at the time. I don't have much if any extra stuff on Firefox. Using Windows 10 and probably have a slow connection.

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