Which browsers does Joomla support?

For Joomla 4, 5, and 6: the current major version and the one before it of Chrome, Edge, Firefox, and Safari. Internet Explorer is not supported. The old Joomla 3 browser list is not the matrix for current releases.

Why does the Joomla administrator show one column on a Mac in Safari?

Safari 15 and older do not understand the ranged media queries in Joomla 4.4.1 and newer core CSS, so the responsive grid collapses. Update to Safari 16.4 or newer, or use Chrome or Firefox on that Mac.

Why does the article editor keep reloading in Firefox?

Firefox 148 broke TinyMCE in Joomla 5.4.3 and 6.0.3. Install the Firefox 148 TinyMCE hotfix from the Joomla download page or update to 5.4.4 / 6.0.4 or newer.

Why does the site look fine in Chrome and broken in Safari?

Check a private window, then the console. If the layout is the mobile layout on a wide screen, check the Safari version. If only login fails, compare the Global Configuration site URL with the host Safari is using, including www and HTTPS.

Why is the administrator broken in Internet Explorer?

Joomla 4 and newer use Bootstrap 5 and modern JavaScript. IE11 is outside that support. Use Edge or another current browser.

Will HTML5 Shiv or Respond.js fix it?

No. Those scripts patched Internet Explorer 8. They do not fix Joomla 4, 5, or 6, and they should come out of the template.

The layout breaks on phones but not on desktop. Is that a browser bug?

No. If every browser breaks at the same width, it is responsive CSS or a missing viewport tag. If only iOS overflows at the bottom, replace 100vh with 100dvh.

One browser still shows the old design after I changed the template. Why?

That browser cached the CSS. Test in a private window, then clear Joomla cache and the CDN. Editing user.css does not change Joomla's media version.

Should I load jQuery so older browsers work?

No. Extra jQuery copies cause $ conflicts. Current Joomla does not need jQuery for the core layout.

Can I make Cassiopeia work on Safari 15 without editing core files?

Yes. Transpile media/templates/site/cassiopeia/css/template.min.css with Lightning CSS targeting Safari 15 and save the output as template.min.css inside your child template's css folder. Joomla loads the child's copy first. Replacing media/vendor/bootstrap does nothing for Cassiopeia because Bootstrap is compiled into template.min.css.

Does Cassiopeia work in all browsers?

It works in the browsers Joomla supports. Use it as the control. If Cassiopeia is fine and your template is not, fix or replace the template.

Who can fix a template that only fails in one browser?

Infyways traces the console error and upgrades templates that cannot be patched. Request a Joomla upgrade audit .

Joomla

Fix Joomla Browser Compatibility Issues in Safari, Firefox, Chrome, and Edge

Joomla 4, 5, and 6 support current Chrome, Edge, Firefox, and Safari, not Internet Explorer. Triage cache, templates, and the three documented core bugs: Safari 15 ranged media queries, Firefox 148 TinyMCE, and caching versus the Web Asset Manager.

Abhilash Sahoo

Sep 22, 202620 min read

Fix Joomla Browser Compatibility Issues in Safari, Firefox, Chrome, and Edge

Frequently asked questions

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Written by

Abhilash Sahoo

Abhilash Sahoo, with over 16 years of experience, is Founder & CEO of Infyways Solutions. He builds web platforms and eCommerce on Joomla, WordPress, Shopify, Magento, and OpenCart, plus modern stacks like Next.js, React, Node.js, and Python, with AI agents, automation, and headless CMS when products need to scale.

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Fix Joomla Browser Compatibility Issues in Safari, Firefox, Chrome, and Edge

Frequently asked questions

Abhilash Sahoo

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