Wordpress site works in Chrome and other browsers but NOT in Firefox. Help?

I have a big problem. My site ( http://koebersmaegler.dk ) does not work in Firefox. I can’t upload a screen dump as I am new to this forum, but I can tell you it is a lot of question marks and weird looking symbols. I can copy/paste it, so that is what I did. It fills out the entire browser window with this. Nothing else. In other browsers it seems to not have this error. I am a bit afraid that I have a virus or some sort of malware. Please help if you have any suggestions. It has been looking like this for 3 days, and I don’t know how to solve is. Here is some of the text/symbols that appears in the browser: ���[s�F�(�lU�h�3�=!��.�d)#�r��{[NRٙ��I4I� ��.�j���|/��*�d��/8y����%g���@h��,;ɮ-9��իW�[����󇯾{q���4���ڟ��

Can you see what I mean? Have any of you experienced this? My wordpress theme is Flexform, if that is of any importance.

Thanks in advance.
//Lennart

What character encoding are you using?

If you temporarily switch to the default 2015 theme does the problem persist?

I see exactly the same kind of garbled text in Chromium as I do in Firefox. I ran the page through the W3C Validator and it shows this:

The tutorial mentioned there is this: http://www.w3.org/International/tutorials/tutorial-char-enc/#Slide0250

I don’t use WordPress, so if you need help fixing the above, I’m afraid somebody else will need to step in.

I am not sure if I dare to switch to another theme and risk that I can’t go back or that some tweeks etc made in the flexform theme will not be there when returning.

This problem came up recently without warning or using a new plugin or anything else that could cause a problem. Any WP experts reading this post have any ideas?

Could it be my hosting platform?

utf8_general

+1 Agree
If that risk is greater than your current situation then by all means don’t take the chance…

Ok, thanks, I wont. Our site is not a big site with loads of traffic hurt by this but a niche site with little traffic. But I need to fix the problem anyway. I was told a minute ago, that it could probably be fixed in my wp config php file. But I have no idea … :-/

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