URL for one of those websites is?

Perhaps you turned on an optional accessibility feature intended to assist users of screen reading software from losing their place. Try checking that you have the default setting:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box above the list, type or paste access and pause while the list is filtered

(3) If the accessibility.blockautorefresh preference is bolded and "modified" or "user set" to true, double-click it to restore the default value of false

Does that help?

jfwlsh6 said

Web Sites I run have a number of operational Slideshows. Now when I go to run the Slideshow I have to click to cancel the Message "Firefox has prevented the request to move to another Page" (or similar wording). This must be rather annoying for the users/vistors to these Slideshows. It does not happen when using Google Chrome. I realise this is a Security function but is there any way that I can set up in my Slideshow Generating PHP system that will override this setting please?

Many thanks for this analysis of the problem. It is solved by the instructions provided!

the-edmeister said

URL for one of those websites is?

Given the instructions from another contributor to check for accessibility.blockautorefresh, this was the problem and by resettting to Default the Slideshows now run as intended but thanks for offering to contribute.

Hi jfwlsh6, if you think many users of your slide show will run into the same problem, you could consider changing how it loads new slides. That feature only triggers on certain methods.