JavaScript does not work, even if activated in the preferences

OK, so javascript does not work in my Firefox. I'm going to websites, try to activate some tabs, or similar, and nothing happens. Theres is a new site, which is linked to my University, and when I try to connect I get a message: Javascript must be enabled to use this Web site.
Thing - it is turned on. I tried to restart (close-> close-> open-> mozilla mozilla activate on-> close mozilla-> open mozilla-> go to the website) but no dice...

When I try to use IE, everything works, so I have NO idea what to do... Can anyone help?

Hello

Please check if this occurs in Safe Mode

Extensions of the issues

Troubleshooting Extensions and themes

Uninstalling the modules

Uninstalling toolbars

Tags: Firefox

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Mike

^{Edit: tried to fix style - that didn't work. for the code example, see https://pastebin.mozilla.org/8838794 (philipp)}

I don't think you can use window.document.img_home.src to set the attribute of the source of an image.
In Firefox, you will need to use document.getElementById, or one of the other functions possible getElement (s).
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