My sidebar appears at the bottom of the page in Firefox. I do not use a child theme, nor is my front page static. I normally use Firefox browser, however, I tried it in Edge browser and it works as it should, with the sidebar on the right. Is that something you are aware of? Is there anything I can/need to do or is it something that would have to be fixed in the theme? Here is the link to my site: http://rakitacraft.co.uk.gridhosted.co.uk/
Thanks very much, Jenia
I hope you are well today and thank you for your question.
I have tested your shared site on Firefox browser and it is working fine for me as shown in the attached screenshot.
Please make sure you are using latest version of browser, try clearing your browser cache and test it by logging out from your site.