I have ordered some goods online and have been offered the option to track the goods. But I can't, because Firefox thinks the tracking page has a fake certificate. I can go to the website of the delivery company and it has a box where I can enter the order number. This is ambiguous (more than one supplier uses the company) so it lists the two possibilities. I click on the right one and it is at this stage I get the fake certificate warning. I cannot bypass it, because trying to do so simply brings up the same warning. I've been in touch with the suppliers. Their customer service desk can track the order with no problem. So where is the problem? They say they can track it using Firefox on Windows, Android and Mac systems but have no Linux available. I only have two Linux systems here (Ubuntu 22.04 and 20.04), running the latest Firefox on offer (128.0.2 64 bit), both of which throw up the fake certificate problem, but with slightly different certificate dates (within the last 5 weeks), older than the genuine cert. I have pdfs of both the genuine one and one of the fake ones as produced by Firefox. This is not a show-stopper this time as I can track the order by phone and email, but there is clearly a problem somewhere, either with both the Firefox versions I have or with the certification verification process. If it's a Firefox issue, I don't know how to let them know.