The problem is in website css, if you check the console(Ctrl+Shift+K) you can see some styles being dropped. The phones' image is staying exactly over the menu.

Thank you for your answer, but I am sorry that I do not understand...

I have never used the Console. If I open it on another website (e.g. this Mozilla support page), I get a bunch of info. If I open it on http://mysleepbot.com/ it is blank. Not sure what to do with this?

Can I somehow make the website links to work in Firefox or is it a fixable bug? As I mentioned above, the links work fine in Chrome.

p.s. What did you mean by "The phones' image is staying exactly over the menu." How can you see that?

The solution is notify the site owners, they can solve this problem, I mentioned the console only to you know the problem is on website not in your browser. There are differences between Firefox and Chrome, this is why the page works in one and not another, probably some CSS selector is not supported by Firefox is the problem

It is caused by the margin-top:-60px setting for the DIV .hero_device right container. This causes this container to cover the DIV .navheader (the top part of the Sign Up button is still active).

Reducing to margin-top:-20px make the line clickable.

• http://mysleepbot.com/resources/public2/css/1369003883.css

.hero_device {
    background: url('/resources/public2/img/hero_device.png') no-repeat;
    height: 760px;
    width: 630px;
    display:inline;
    padding: 0 10px 0 0;
    margin: -60px 0 0 0; /* change to margin: -20px 0 0 0; */
    position:absolute;

}

I I have found several sites with this issue (works in Chrome but not in Firefox). Couldn't the CCS selector be "fixed" in Firefox? Otherwise, I would need to switch to Chrome every time I encounter a problematic website.

Actually Google Chrome shows an a issue as well on that page as the container I mentioned above covers the bottom part of the Sign UP button (below the text), so it is less worse than in Firefox.