I have an html5 appcache running on a website, it works fine in Safari, Opera and Chrome but it fails to work on Firefox. I have the following in my code: &lt;!DOCTYPE HTML&gt;<br/> &lt;html manifest="./manifest.appcache"&gt;<br/> &lt;head&gt;<br/> and the following manifest.appcache file: CACHE MANIFEST<br/> /<br/> /accessibility<br/> /anchoring<br/> /areas-of-application-in-business<br/> /calibrating-rep-system-preferences<br/> /circle-of-excellence<br/> /collapse-anchors<br/> /contrastive-analysis-and-mapping-across<br/> /convincers<br/> /creating-an-air-of-authority<br/> /decision-making<br/> /elicitation-of-submodalities<br/> /embedded-commands<br/> /embedded-commands-2<br/> /eye-patterns<br/> /four-types-of-feedback<br/> /home<br/> /how-to-remember-names<br/> /introduction-to-anchoring<br/> /introduction-to-nlp<br/> /key-elements-of-the-meta-model<br/> /language-and-communication-model<br/> /language-patterns<br/> /leadership<br/> /modelling<br/> /my-action-plan<br/> /new-behaviour-generator<br/> /nlp-presuppositions<br/> /outcome-thinking<br/> /pacing-and-leading<br/> /perceptual-positions<br/> /predicate-phrases<br/> /predicates<br/> /preference-test<br/> /presupposition-cards<br/> /presuppositions<br/> /privacy<br/> /rapport<br/> /rapport-pacing-and-leading<br/> /representational-systems<br/> /sensory-acuity<br/> /strategies<br/> /structure-for-adjusting-feedback<br/> /structure-of-nlp-techniques<br/> /structure-vs-content<br/> /submodalities<br/> /submodalities-and-strategies<br/> /submodalities-checklist<br/> /terms-and-conditions<br/> /the-6-deadly-words<br/> /the-meta-mirror<br/> /the-power-of-presuppositions<br/> /the-problem-frame-and-the-outcome-frame<br/> /user-profile<br/> /well-formed-outcomes<br/> /what-is-nlp<br/> /userImages/nlp_language_comm.png<br/> /css/mobile.css<br/> /css/style.css<br/> <br/> <br/> I am using the code from here: http://jonathanstark.com/blog/2009/09/27/debugging-html-5-offline-application-cache/ to debug the appcache and display the output on the site. In firefox the output from the debug code shows it downloading all the files and calling swap cache. If I then disconnect from the internet and click on a link to another page which should have downloaded I get the Unable to Connect message in Firefox, while doing the same in Safari, Opera and Chrome it works fine. Any help and suggestions would be appreciated. Thanks