Hello Solidjeuh, try clear Cookies & Cache and check it again.

thank you

It's not only on my pc All firefox users are complaining that the website loads very slow.

I see that you or an extension (Tweak Network) have made changes to network.http prefs and such tweaks may have the advert effect and slow down Firefox on some websites.
So you can try to reset all network.http prefs to the default on the about:config page or undo the changes in the extension.

• http://kb.mozillazine.org/about:config

I installed the tweak today, Just to try my website with that tweak.. Everyting is back to default now.. But like I said, It's not only here, But with all firefox users..

You can use the Web Console (Web Developer > Web Console; Shift+Ctrl+K) to check how fast the files are loaded and what is causing the delay.

• https://developer.mozilla.org/en/Tools/Web_Console

Ahaa! Thank you so much! I found the problem. There where more then 15 jquery's that the site wanted to load.. But those files are removed from the server.. So I removed them from the overal_header_hook.html And the site is working ferfect now! Thank you :)

You're welcome