HI, there appears to be an issue that only affects users who have turned off Cleartype Font rendering within their Windows Settings. So a workaround for the moment would either be to turn Cleartype back on or disabling hardware acceleration in Firefox: https://support.mozilla.org/en-US/kb/performance-settings Check if this is the viewing issue. There are several versions of jquery going on here. and a lot of errors in the HTML which Firefox does not like, other browser are not as strict. https://appifly.org/?APPI-professionals-list&lang=en I think if you fix your code, might not have problems. 1st URL Only done. HTML Errors - https://validator.w3.org/nu/?doc=https%3A%2F%2Fappifly.org%2F%3FAPPI-professionals-list%26lang%3Den CSS Erors - https://jigsaw.w3.org/css-validator/validator?uri=https%3A%2F%2Fappifly.org%2F%3FAPPI-professionals-list%26lang%3Den&profile=css3svg&usermedium=all&warning=1&vextwarning=&lang=en W3C.org (World Wide Web Consortium) in charge of standards and practices and future development of web pages and web browsers make the rules on code. Mozilla Firefox follows these rules. W3C.org Who make the rules for web code. HTML https://validator.w3.org/ CSS https://jigsaw.w3.org/css-validator/ and https://validator.w3.org/i18n-checker/ and http://mobile.css-validator.org/ Please let us know if this solved your issue or if need further assistance.