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I have problem with header of the site. It work correctly in all web browser except mozilla firefox.

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I open my web-site ico.paymon.org and it works incorrect. The problem is, that the header of the site is too wide. It shown correctly in all web browsers except mozilla firefox. I have this problem on FullHD screen, but not on 1280*1024. Do you know the reason of that? Help me please with that.

I open my web-site ico.paymon.org and it works incorrect. The problem is, that the header of the site is too wide. It shown correctly in all web browsers except mozilla firefox. I have this problem on FullHD screen, but not on 1280*1024. Do you know the reason of that? Help me please with that.
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Toutes les réponses (1)

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The element

<div class="navbar-header">

has

float: left

In your first screenshot it seems to be turned off, forcing a separate line for the menus.

But I don't know why.

Does reloading the page bypassing the cache (Ctrl+Shift+r) make any difference? Clearing cookies for the site?

This forum focuses more on end-user support. You could try one of the sites mentioned in this article: Where to go for developer support