CSS hack for Firefox

Hi!
My problem is that my forum doesn't look good in Firefox. I coded it in Chrome by the way and tried to fix it with this "hack":

Code:

@-moz-document url-prefix() {
#id { stuff }
.class { stuff }
}

And it didn't work, some things in the forum still looked out of position and so on...
I want to know if there is a way to solve this... a code or whatever. Thanks!

Forum link?

It would help if you explained what specifically looks wrong.

Link: Here 
In case you see funny colors is because I'm still editing some things.

@SLGray I can't point to all of them because there are many little details that change from Chrome to Firefox. I've used the same hack in posts and it works but not when I use it for the forum :c

In terms of CSS support, Chrome and Firefox are pretty good, even the latest version of IE isn't too bad. Granted, there are always going to be minor differences, but overall it's going to look identical if everything is marked up correctly.

I looked at your forum on both Chrome and Firefox. At first glance the only noticeable difference I see would be that of the font weight, and of course the select boxes. Could you point out a few that are really bothering you ? It'll save me time of constantly switching between Chrome and Firefox.

Oh and one more thing, try disabling Optimize your CSS, it's just below the stylesheet. This can sometimes cause things not to work, such as keyframe animations.

@Ange Tuteur Hi! I disabled the Optimize your CSS option but then in Chrome the category titles looked out of the position I wanted and didn't solve the Firefox look either.

This image is how it looks when viewed in Chrome:



And this one when viewed in Firefox:


I thought there were more details to change but it seems it's just those I pointed lol
Now I'm thinking... I haven't updated Firefox in a while. May that be the problem that I see it that way? Because I'm sure I can update it but what if my users can't for whatever reason?

Edit: Firefox updated and there are no changes :c

Bump.

Bump.

you should probably check your code for mistakes, because if it's that "broken" in firefox it's probably not for incompatibility but because chrome ignores your mistakes and firefox does not..

I don't know much about codes but I will try to do that. And don't know either if it's allowed to ask in this same thread but... any tips that may help me?
Thanks!

What I personally like to do is check the consoles for any errors. I looked at your site and saw 2 errors in your console. It MIGHT make a difference.