Is there any ads being forced through by domain ISP ? Send the link to the site please.

http://www.actionlearningassociates.co.uk/ There's no advertising. There's a few scripts that call for iframes when activated but no references to 'flash', 'shockwave' or 'adobe' in the source code

W3C.org (World Wide Web Consortium) in charge of browsers, web pages code and future code. Mozilla adheres to the rules and practices and standards that are set by the W3C So that being said Firefox has been playing a little literal regarding code. But if code is good should have no problems and can be seen in any browser. Though that can change on any day someone updates a browser (am sure you know). Also Google likes clean code and rankings go up. Got 3 pages on 1st page so guess it works. Is there any way you can clean up this code ? HTML https://validator.w3.org/ RESULTS https://validator.w3.org/nu/?doc=http%3A%2F%2Fwww.actionlearningassociates.co.uk%2F CSS https://jigsaw.w3.org/css-validator/ RESULTS https://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fwww.actionlearningassociates.co.uk%2F&profile=css3&usermedium=all&warning=1&vextwarning=&lang=en https://validator.w3.org/unicorn/ https://validator.w3.org/unicorn/check?ucn_uri=www.actionlearningassociates.co.uk%2F&ucn_task=conformance# Please let us know if this solved your issue or if need further assistance.

You appear to be using a old Flash 24.0 version as the current is 27.0.0.187 https://get.adobe.com/flashplayer/ The Flash Player 27.0.0.159 and older versions were set to click to play block back in October due to critical vulnerabilities. https://addons.mozilla.org/blocked/