works differently in firefox

I checked out the links but couldn’t see the plugin enabled.

Thanks for checking.
Look for the small ‘+’ ( bottom center below the line)

Another strange thing:
Sometimes (not always)the tab content is pushed up way too high. After clearing cache it is in the right position. (Safari & Chrome)

It looks like you’ve made some changes to the CSS – if you can reset to the original and I’ll take another look. Just to rule out the possibility that changes you’ve made are affecting the plugin.

updated now to 1.0.4. and the original style.css is now on.

Still same issue: In Firefox it is still too low.

Also try this: When the slider is on up very high (the line man high above the line), then clear cache and the slider doesn’t move up so high.

Haven’t checked it on IE, cause i am on Mac.

Okay, I’ve checked your site on FF, Chrome and IE on Mac and PC and can see there are some inconsistencies in the tab height.

However, when I check using your content (the animated gif) in a standard installation of WP with Twenty Thirteen theme and no other plugins, there are no inconsistencies.

So I would recommend disabling your plugins and switching back to a standard theme, then re-enabling each one by one until you can identify which plugin/theme is causing the problem.

pity, but thanks for checking.

Will try to find another way.

Looks like the handling of the images is inconsistent.

When there is only text in the tab content, then it works fine throughout all browsers.

But that inconsistency may originate from another plugin or from your theme itself. As I said, I tested the animated gif from your site in a vanilla install and there was no inconsistency.