Firefox Errors

Hya,
A Firefox problem..this WordPress used to be called Pondok then I lost touch with the creator. All style sheets had been built around the default. To all intents and purposes its exactly the same only the name has been changed to ‘Man of the Forest’.

I know I have the text too large in the sidebar and don’t know how to change that but the problem is mainly that there are errors in Firefox. would some kind person test it in Firefox please.

I tried to look at sidebar.php but nothing to edit for the oversize so where else please? It could be in style.css but which one need altering ..lolol There are three style.css files. one is normal css, one is style.j17.css, and the other is style17a.css. Are three really needed?

I do have two friends testing it also but more would be welcome.
Thanks

https://katesdreamweavercentre.com/manoftheforest/